Try -v or -d options with the host command, it will show that a second query for an e-mail server is made ("... IN  MX").  As the Isilon doesn't expect to receive e-mails from outside, nor has it any idea who else should handle such mails on its behave, that query fails.  The host command simply does too much by default;  if you just want to query the IP address, use:  host -t A isis.domain.com 172.17.X.X  hth  -- Peter
Hello all,  this is my first question in this site, let me apologize in advance if I miss some information or I'm asking something already answered, but I've not found the solution in this site after some time looking for it... One of our Isilon subnet  (subnet0) is configured like:  The address pol:   And the SmartConnect   Zone name:  Connection policy: Connection Count[IMAGE]   SmartConnect service subnet: subnet0[IMAGE]   IP allocation method: Dynamic[IMAGE]   Rebalance policy: Automatic Failback[IMAGE]   IP failover policy:     Everything seems ok, but when I ask the DNS server I get something that I don't really understand   $ host isis.domain.com 172.17.X.X Using domain server: Name: 172.17.X.X Address: 172.17.X.X#53 Aliases:    isis.domain.com has address 172.17.Y.Y Host isis.domain.com not found: 5(REFUSED)  I'm not a DNS expert, but the second line looks weird.   dig output looks better:  $ dig [NAME].17.X.X isis.domain.com   ; <<>> DiG 9.9.5-3-Ubuntu <<>> [NAME].17.X.X isis.domain.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4564 ;; flags: qr aa rd ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available   ;; QUESTION SECTION: ;isis.domain.com.                       IN      A   ;; ANSWER SECTION: isis.domain.com.                0       IN      A       172.17.Y.Y   ;; Query time: 0 msec ;; SERVER: 172.17.X.X#53(172.17.19.100) ;; WHEN: Wed Nov 12 09:58:56 CET 2014 ;; MSG SIZE  rcvd: 45  But I'm worried about the host output...  Anyone could give an explanation about the second line, the one saying "not found"?  Many thanks in advance! Arnau  
Isilon DNS problems?