user43935: I am trying to build c-lightning from source and connect to testnet.

bitcoind is up and running in testnet already.
Running lightningd seems to be working good except for the following log:


connectd: Failed to create 2 socket: Address already in use

Full log at the bottom of the post.
Now when I try running 'cli/lightning-cli', I am getting the following error:

lightning-cli: Connecting to 'lightning-rpc': Connection refused

Any hint on what I am doing wrong?
bitcoin.conf
mintxfee=0.00002
testnet=1
prune=0
txconfirmtarget=6
txindex=1

.lightning/testnet/config
[empty]
~/projects/btc/lightning master ?1 ❯ lightningd/lightningd --network=testnet --log-level=debug
2022-01-09T15:15:13.424Z DEBUG   plugin-manager: started(1128) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/autoclean    
2022-01-09T15:15:13.427Z DEBUG   plugin-manager: started(1129) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/bcli    
2022-01-09T15:15:13.428Z DEBUG   plugin-manager: started(1130) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/fetchinvoice    
2022-01-09T15:15:13.429Z DEBUG   plugin-manager: started(1131) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/funder
2022-01-09T15:15:13.430Z DEBUG   plugin-manager: started(1132) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/topology
2022-01-09T15:15:13.431Z DEBUG   plugin-manager: started(1133) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/keysend
2022-01-09T15:15:13.434Z DEBUG   plugin-manager: started(1134) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/offers
2022-01-09T15:15:13.436Z DEBUG   plugin-manager: started(1135) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/pay
2022-01-09T15:15:13.440Z DEBUG   plugin-manager: started(1136) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/txprepare
2022-01-09T15:15:13.450Z DEBUG   plugin-manager: started(1137) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/spenderp
2022-01-09T15:15:13.476Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_channeld
2022-01-09T15:15:13.489Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_closingd
2022-01-09T15:15:13.501Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_connectd    
2022-01-09T15:15:13.514Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_gossipd    
2022-01-09T15:15:13.527Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_hsmd
2022-01-09T15:15:13.539Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_onchaind
2022-01-09T15:15:13.555Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_openingd
2022-01-09T15:15:13.569Z DEBUG   hsmd: pid 1145, msgfd 36
2022-01-09T15:15:13.613Z DEBUG   connectd: pid 1146, msgfd 40
2022-01-09T15:15:13.613Z DEBUG   hsmd: new_client: 0
2022-01-09T15:15:14.708Z DEBUG   connectd: Created IPv6 listener on port 19735
2022-01-09T15:15:14.708Z DEBUG   **connectd: Failed to create 2 socket: Address already in use**
2022-01-09T15:15:14.708Z DEBUG   connectd: REPLY WIRE_CONNECTD_INIT_REPLY with 0 fds
2022-01-09T15:15:14.711Z DEBUG   gossipd: pid 1147, msgfd 39
2022-01-09T15:15:14.712Z DEBUG   hsmd: new_client: 0
2022-01-09T15:15:14.739Z DEBUG   gossipd: gossip_store_compact_offline: 0 deleted, 0 copied
2022-01-09T15:15:14.739Z DEBUG   gossipd: total store load time: 0 msec    
2022-01-09T15:15:14.739Z DEBUG   gossipd: gossip_store: Read 0/0/0/0 cannounce/cupdate/nannounce/cdelete from store (0 deleted) in 1 bytes
2022-01-09T15:15:14.739Z DEBUG   gossipd: seeker: state = STARTING_UP New seeker
2022-01-09T15:15:14.739Z DEBUG   gossipd: REPLY WIRE_GOSSIPD_INIT_REPLY with 0 fds
2022-01-09T15:15:14.766Z INFO    plugin-bcli: bitcoin-cli initialized and connected to bitcoind.
2022-01-09T15:15:14.766Z DEBUG   lightningd: All Bitcoin plugin commands registered
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate opening fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate mutual_close fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate unilateral_close fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate delayed_to_us fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate htlc_resolution fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate penalty fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate min_acceptable fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate max_acceptable fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for opening initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for opening set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for mutual_close initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for mutual_close set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for unilateral_close initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for unilateral_close set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for delayed_to_us initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for delayed_to_us set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for htlc_resolution initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for htlc_resolution set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for penalty initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for penalty set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for min_acceptable initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for min_acceptable set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for max_acceptable initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for max_acceptable set to 253 (was 0)
2022-01-09T15:15:14.797Z DEBUG   lightningd: Adding block 2135126: 000000008bb23bbb0c06793bf1f7d47539284284f4019fd6b2058d9cf639d21b
2022-01-09T15:15:14.799Z DEBUG   wallet: Loaded 0 channels from DB
2022-01-09T15:15:14.799Z DEBUG   plugin-autoclean: autocleaning not active
2022-01-09T15:15:14.800Z DEBUG   connectd: REPLY WIRE_CONNECTD_ACTIVATE_REPLY with 0 fds
2022-01-09T15:15:14.800Z INFO    lightningd: --------------------------------------------------
2022-01-09T15:15:14.800Z INFO    lightningd: Server started with public key 027d0b5558e6e36a396b4335c51e28d1ec1dbf72a16e98fd87195900626bafdfa9, alias LOUDMONKEY (color #027d0b) and lightningd v0.10.2-193-g73bf4b2
2022-01-09T15:15:14.801Z DEBUG   plugin-fetchinvoice: Killing plugin: disabled itself at init: offers not enabled in config
2022-01-09T15:15:14.816Z DEBUG   lightningd: Adding block 2135127: 0000000000000062ec0632a5d644af1f8afaf0a48a6fecb085df2ef3b565e16c
2022-01-09T15:15:14.833Z DEBUG   lightningd: Adding block 2135128: 000000000000003e17b3b33db5c6e4b84e37494113a8e05b3276faa0f0cd1a30
2022-01-09T15:15:14.850Z DEBUG   lightningd: Adding block 2135129: 00000000000000a56ee0d7633edb05e7dff4b0ffdb1704c894aeb02af733c6f7
2022-01-09T15:15:14.864Z DEBUG   lightningd: Adding block 2135130: 0000000000000085f0749193775b45aad712b0fa5f7e0dfa4d8afd8f5e8fde45
2022-01-09T15:15:14.888Z DEBUG   lightningd: Adding block 2135131: 0000000000000024caf34c595d117e4b6729a38b936ab010bf5547c67de6c48c
2022-01-09T15:15:14.906Z DEBUG   lightningd: Adding block 2135132: 00000000000000399294cc5da617128504730e94a12763213baa961796d15fe3
2022-01-09T15:15:14.926Z DEBUG   lightningd: Adding block 2135133: 000000000000002ee9fe70ac60f798ae0e1d66321d0e626488247f23bdda8c09
2022-01-09T15:15:14.945Z DEBUG   lightningd: Adding block 2135134: 00000000000000a19c79d61e03cb3e338aaf7921899d62d7ee5be705256a45fe
2022-01-09T15:15:14.966Z DEBUG   lightningd: Adding block 2135135: 000000000000006f09a3cff85a2a306b2763209f0be21906aca283255448f208
2022-01-09T15:15:14.986Z DEBUG   lightningd: Adding block 2135136: 00000000000000b18f16cb1a7f6f760f7383a19827773cccf997b02a3318ec46
2022-01-09T15:15:15.008Z DEBUG   lightningd: Adding block 2135137: 00000000ee0aa9141988d131ff588cb09d19d241bd63b5c8b0a1d00939fb54df
2022-01-09T15:15:15.029Z DEBUG   lightningd: Adding block 2135138: 000000009c14602deffbd3296922ba55b832098c9cf80677443adad83b77ca49
2022-01-09T15:15:15.047Z DEBUG   lightningd: Adding block 2135139: 000000000000009729cd3655bc2595677a9ece071118e3c7cb3fa98ab5268d18
2022-01-09T15:15:15.068Z DEBUG   lightningd: Adding block 2135140: 000000000000009286ae27a488a8550b2f0e05dbb9cc6abfa8b0afff346f0b34
2022-01-09T15:15:15.087Z DEBUG   lightningd: Adding block 2135141: 00000000000000523e1e32edc3a04564a2150d2601b75944e32707d604808c8f
2022-01-09T15:15:15.105Z DEBUG   lightningd: Adding block 2135142: 000000000000008df2e08bbe7c9ff7cc35c6e3c9ecb87232f298b8de4850bafc
2022-01-09T15:15:15.125Z DEBUG   lightningd: Adding block 2135143: 00000000000000b5c83bce8a8c009c7ada0c0bc5426716152f9c341c4739a5c7    
2022-01-09T15:15:15.143Z DEBUG   lightningd: Adding block 2135144: 00000000000000b118033b20ea53c451b35716120b7d69b56cb0f9d9dfc6b831    
2022-01-09T15:15:15.160Z DEBUG   lightningd: Adding block 2135145: 000000000000006b802f3cfc151f86cb733eaf8e6aa388fd9b3d0a68fa4bbd3f    
2022-01-09T15:15:15.177Z DEBUG   lightningd: Adding block 2135146: 000000000000005ed7dc430678d687384696e74a28299331a67588905bf6f062    
2022-01-09T15:15:15.194Z DEBUG   lightningd: Adding block 2135147: 000000000000009142e2da8958b8533781f807beea4df488f6e74eaa4087d671    
2022-01-09T15:15:15.212Z DEBUG   lightningd: Adding block 2135148: 000000000000005a3484239a08c9fb094778b1dbfae0b9ee1dfc1d9069295b69    
2022-01-09T15:15:15.230Z DEBUG   lightningd: Adding block 2135149: 00000000000000953fac4e6bfd7bbf289f4f9d6b2f8092c37947eaabc41b9051    
2022-01-09T15:15:15.247Z DEBUG   lightningd: Adding block 2135150: 00000000000000214f530ce76011c286ce4fe7260c84b66123d9953aa603149c    
2022-01-09T15:15:15.266Z DEBUG   lightningd: Adding block 2135151: 0000000054b144f5377980ce5ec91a93119572f7f58bfd373c0610356616deb7    
2022-01-09T15:15:15.293Z DEBUG   lightningd: Adding block 2135152: 00000000000000255efddc5b3be3d3f7e140f66d0832b58d054c9e3fd667a742    
2022-01-09T15:15:15.313Z DEBUG   lightningd: Adding block 2135153: 000000000000002eaf2064f55304904e87bbb0e39f4faf2b3ecd177fd5d0ecb8    
2022-01-09T15:15:15.333Z DEBUG   lightningd: Adding block 2135154: 000000001f8ecb22687773b4a314faf1add87c8d0ce81d1cc4fb9d27100937a3    
2022-01-09T15:15:15.356Z DEBUG   lightningd: Adding block 2135155: 0000000009280cf53408e61dc935ed553b88c45b70a5d2dc77954ef4ec65757a    
2022-01-09T15:15:15.374Z DEBUG  


user81940: It looks like you have lightningd already running and are trying to start it for a second time hence the error that it can't open the socket.
When you run lightningd on testnet you also have to tell lightning-cli to run on testnet. So I assume lightning-cli tries to connect to the mainnet lightning-rpc which doesn't exist or is down.
So one thing you could do is try to run lightning-cli --network=testnet getinfo the other thing is you could specify  the data-dir of lightningd as a command line argument so that it will find the correct lightning-rpc. Both can be done in your config instead of command line arguments.

43935: <p>I am trying to build c-lightning from source and connect to testnet.</p>
<ul>
<li>bitcoind is up and running in testnet already.</li>
<li>Running lightningd seems to be working good except for the following log:</li>
</ul>
<blockquote>
<p>connectd: Failed to create 2 socket: Address already in use</p>
</blockquote>
<p>Full log at the bottom of the post.</p>
<p>Now when I try running 'cli/lightning-cli', I am getting the following error:</p>
<blockquote>
<p>lightning-cli: Connecting to 'lightning-rpc': Connection refused</p>
</blockquote>
<p>Any hint on what I am doing wrong?</p>
<p>bitcoin.conf</p>
<pre><code>mintxfee=0.00002
testnet=1
prune=0
txconfirmtarget=6
txindex=1
</code></pre>
<p>.lightning/testnet/config
[empty]</p>
<pre><code>~/projects/btc/lightning master ?1 ❯ lightningd/lightningd --network=testnet --log-level=debug
2022-01-09T15:15:13.424Z DEBUG   plugin-manager: started(1128) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/autoclean    
2022-01-09T15:15:13.427Z DEBUG   plugin-manager: started(1129) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/bcli    
2022-01-09T15:15:13.428Z DEBUG   plugin-manager: started(1130) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/fetchinvoice    
2022-01-09T15:15:13.429Z DEBUG   plugin-manager: started(1131) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/funder
2022-01-09T15:15:13.430Z DEBUG   plugin-manager: started(1132) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/topology
2022-01-09T15:15:13.431Z DEBUG   plugin-manager: started(1133) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/keysend
2022-01-09T15:15:13.434Z DEBUG   plugin-manager: started(1134) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/offers
2022-01-09T15:15:13.436Z DEBUG   plugin-manager: started(1135) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/pay
2022-01-09T15:15:13.440Z DEBUG   plugin-manager: started(1136) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/txprepare
2022-01-09T15:15:13.450Z DEBUG   plugin-manager: started(1137) /Users/saiy2k/projects/btc/lightning/lightningd/../plugins/spenderp
2022-01-09T15:15:13.476Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_channeld
2022-01-09T15:15:13.489Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_closingd
2022-01-09T15:15:13.501Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_connectd    
2022-01-09T15:15:13.514Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_gossipd    
2022-01-09T15:15:13.527Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_hsmd
2022-01-09T15:15:13.539Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_onchaind
2022-01-09T15:15:13.555Z DEBUG   lightningd: testing /Users/saiy2k/projects/btc/lightning/lightningd/lightning_openingd
2022-01-09T15:15:13.569Z DEBUG   hsmd: pid 1145, msgfd 36
2022-01-09T15:15:13.613Z DEBUG   connectd: pid 1146, msgfd 40
2022-01-09T15:15:13.613Z DEBUG   hsmd: new_client: 0
2022-01-09T15:15:14.708Z DEBUG   connectd: Created IPv6 listener on port 19735
2022-01-09T15:15:14.708Z DEBUG   **connectd: Failed to create 2 socket: Address already in use**
2022-01-09T15:15:14.708Z DEBUG   connectd: REPLY WIRE_CONNECTD_INIT_REPLY with 0 fds
2022-01-09T15:15:14.711Z DEBUG   gossipd: pid 1147, msgfd 39
2022-01-09T15:15:14.712Z DEBUG   hsmd: new_client: 0
2022-01-09T15:15:14.739Z DEBUG   gossipd: gossip_store_compact_offline: 0 deleted, 0 copied
2022-01-09T15:15:14.739Z DEBUG   gossipd: total store load time: 0 msec    
2022-01-09T15:15:14.739Z DEBUG   gossipd: gossip_store: Read 0/0/0/0 cannounce/cupdate/nannounce/cdelete from store (0 deleted) in 1 bytes
2022-01-09T15:15:14.739Z DEBUG   gossipd: seeker: state = STARTING_UP New seeker
2022-01-09T15:15:14.739Z DEBUG   gossipd: REPLY WIRE_GOSSIPD_INIT_REPLY with 0 fds
2022-01-09T15:15:14.766Z INFO    plugin-bcli: bitcoin-cli initialized and connected to bitcoind.
2022-01-09T15:15:14.766Z DEBUG   lightningd: All Bitcoin plugin commands registered
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate opening fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate mutual_close fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate unilateral_close fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate delayed_to_us fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate htlc_resolution fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate penalty fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate min_acceptable fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Unable to estimate max_acceptable fees
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for opening initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for opening set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for mutual_close initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for mutual_close set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for unilateral_close initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for unilateral_close set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for delayed_to_us initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for delayed_to_us set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for htlc_resolution initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for htlc_resolution set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for penalty initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for penalty set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for min_acceptable initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for min_acceptable set to 253 (was 0)
2022-01-09T15:15:14.774Z DEBUG   lightningd: Smoothed feerate estimate for max_acceptable initialized to polled estimate 253
2022-01-09T15:15:14.774Z DEBUG   lightningd: Feerate estimate for max_acceptable set to 253 (was 0)
2022-01-09T15:15:14.797Z DEBUG   lightningd: Adding block 2135126: 000000008bb23bbb0c06793bf1f7d47539284284f4019fd6b2058d9cf639d21b
2022-01-09T15:15:14.799Z DEBUG   wallet: Loaded 0 channels from DB
2022-01-09T15:15:14.799Z DEBUG   plugin-autoclean: autocleaning not active
2022-01-09T15:15:14.800Z DEBUG   connectd: REPLY WIRE_CONNECTD_ACTIVATE_REPLY with 0 fds
2022-01-09T15:15:14.800Z INFO    lightningd: --------------------------------------------------
2022-01-09T15:15:14.800Z INFO    lightningd: Server started with public key 027d0b5558e6e36a396b4335c51e28d1ec1dbf72a16e98fd87195900626bafdfa9, alias LOUDMONKEY (color #027d0b) and lightningd v0.10.2-193-g73bf4b2
2022-01-09T15:15:14.801Z DEBUG   plugin-fetchinvoice: Killing plugin: disabled itself at init: offers not enabled in config
2022-01-09T15:15:14.816Z DEBUG   lightningd: Adding block 2135127: 0000000000000062ec0632a5d644af1f8afaf0a48a6fecb085df2ef3b565e16c
2022-01-09T15:15:14.833Z DEBUG   lightningd: Adding block 2135128: 000000000000003e17b3b33db5c6e4b84e37494113a8e05b3276faa0f0cd1a30
2022-01-09T15:15:14.850Z DEBUG   lightningd: Adding block 2135129: 00000000000000a56ee0d7633edb05e7dff4b0ffdb1704c894aeb02af733c6f7
2022-01-09T15:15:14.864Z DEBUG   lightningd: Adding block 2135130: 0000000000000085f0749193775b45aad712b0fa5f7e0dfa4d8afd8f5e8fde45
2022-01-09T15:15:14.888Z DEBUG   lightningd: Adding block 2135131: 0000000000000024caf34c595d117e4b6729a38b936ab010bf5547c67de6c48c
2022-01-09T15:15:14.906Z DEBUG   lightningd: Adding block 2135132: 00000000000000399294cc5da617128504730e94a12763213baa961796d15fe3
2022-01-09T15:15:14.926Z DEBUG   lightningd: Adding block 2135133: 000000000000002ee9fe70ac60f798ae0e1d66321d0e626488247f23bdda8c09
2022-01-09T15:15:14.945Z DEBUG   lightningd: Adding block 2135134: 00000000000000a19c79d61e03cb3e338aaf7921899d62d7ee5be705256a45fe
2022-01-09T15:15:14.966Z DEBUG   lightningd: Adding block 2135135: 000000000000006f09a3cff85a2a306b2763209f0be21906aca283255448f208
2022-01-09T15:15:14.986Z DEBUG   lightningd: Adding block 2135136: 00000000000000b18f16cb1a7f6f760f7383a19827773cccf997b02a3318ec46
2022-01-09T15:15:15.008Z DEBUG   lightningd: Adding block 2135137: 00000000ee0aa9141988d131ff588cb09d19d241bd63b5c8b0a1d00939fb54df
2022-01-09T15:15:15.029Z DEBUG   lightningd: Adding block 2135138: 000000009c14602deffbd3296922ba55b832098c9cf80677443adad83b77ca49
2022-01-09T15:15:15.047Z DEBUG   lightningd: Adding block 2135139: 000000000000009729cd3655bc2595677a9ece071118e3c7cb3fa98ab5268d18
2022-01-09T15:15:15.068Z DEBUG   lightningd: Adding block 2135140: 000000000000009286ae27a488a8550b2f0e05dbb9cc6abfa8b0afff346f0b34
2022-01-09T15:15:15.087Z DEBUG   lightningd: Adding block 2135141: 00000000000000523e1e32edc3a04564a2150d2601b75944e32707d604808c8f
2022-01-09T15:15:15.105Z DEBUG   lightningd: Adding block 2135142: 000000000000008df2e08bbe7c9ff7cc35c6e3c9ecb87232f298b8de4850bafc
2022-01-09T15:15:15.125Z DEBUG   lightningd: Adding block 2135143: 00000000000000b5c83bce8a8c009c7ada0c0bc5426716152f9c341c4739a5c7    
2022-01-09T15:15:15.143Z DEBUG   lightningd: Adding block 2135144: 00000000000000b118033b20ea53c451b35716120b7d69b56cb0f9d9dfc6b831    
2022-01-09T15:15:15.160Z DEBUG   lightningd: Adding block 2135145: 000000000000006b802f3cfc151f86cb733eaf8e6aa388fd9b3d0a68fa4bbd3f    
2022-01-09T15:15:15.177Z DEBUG   lightningd: Adding block 2135146: 000000000000005ed7dc430678d687384696e74a28299331a67588905bf6f062    
2022-01-09T15:15:15.194Z DEBUG   lightningd: Adding block 2135147: 000000000000009142e2da8958b8533781f807beea4df488f6e74eaa4087d671    
2022-01-09T15:15:15.212Z DEBUG   lightningd: Adding block 2135148: 000000000000005a3484239a08c9fb094778b1dbfae0b9ee1dfc1d9069295b69    
2022-01-09T15:15:15.230Z DEBUG   lightningd: Adding block 2135149: 00000000000000953fac4e6bfd7bbf289f4f9d6b2f8092c37947eaabc41b9051    
2022-01-09T15:15:15.247Z DEBUG   lightningd: Adding block 2135150: 00000000000000214f530ce76011c286ce4fe7260c84b66123d9953aa603149c    
2022-01-09T15:15:15.266Z DEBUG   lightningd: Adding block 2135151: 0000000054b144f5377980ce5ec91a93119572f7f58bfd373c0610356616deb7    
2022-01-09T15:15:15.293Z DEBUG   lightningd: Adding block 2135152: 00000000000000255efddc5b3be3d3f7e140f66d0832b58d054c9e3fd667a742    
2022-01-09T15:15:15.313Z DEBUG   lightningd: Adding block 2135153: 000000000000002eaf2064f55304904e87bbb0e39f4faf2b3ecd177fd5d0ecb8    
2022-01-09T15:15:15.333Z DEBUG   lightningd: Adding block 2135154: 000000001f8ecb22687773b4a314faf1add87c8d0ce81d1cc4fb9d27100937a3    
2022-01-09T15:15:15.356Z DEBUG   lightningd: Adding block 2135155: 0000000009280cf53408e61dc935ed553b88c45b70a5d2dc77954ef4ec65757a    
2022-01-09T15:15:15.374Z DEBUG  
</code></pre>
 81940: <p>It looks like you have <code>lightningd</code> already running and are trying to start it for a second time hence the error that it can't open the socket.</p>
<p>When you run <code>lightningd</code> on testnet you also have to tell <code>lightning-cli</code> to run on testnet. So I assume <code>lightning-cli</code> tries to connect to the mainnet <code>lightning-rpc</code> which doesn't exist or is down.</p>
<p>So one thing you could do is try to run <code>lightning-cli --network=testnet getinfo</code> the other thing is you could specify  the data-dir of lightningd as a command line argument so that it will find the correct lightning-rpc. Both can be done in your config instead of command line arguments.</p>
