Hi All, We've upgraded the firmware to 6.7.1.9 and the issue seems to be solved. Thanks for the help. 
Hi All,   I'm facing an issue where my radius server is sending a CoA packet to my Dell N2048P switch, but my radius server responds with 'No response from network device'. Once I debug the switch with command 'debug aaa coa' I get the following logs when sending a CoA:   ../../../../src/application/base/das/das.c dasRequestProcess:1091 Process of request index = 0 ../../../../src/application/base/das/das.c dasRequestProcess:1124 DAC   not found. Packet discarded.   I checked the connectivity between the switch and radius server, the server can be reached from the switch. Next to that, the configuration of the aaa radius server seems normal:  RADIUS server name............................. CLEARPASS-RADIUS-VIP2Current Server IP Address......................  Number of retransmits.......................... 3Timeout duration............................... 15Deadtime....................................... 0RADIUS server auth-port........................ 1812CoA port....................................... 3799Source IP...................................... RADIUS accounting mode......................... Enable Secret configured.............................. Yes Message authenticator.......................... Enable  CoA Bounce-Host-Port........................... Accept  CoA Disable-Host-Port.......................... Accept Number of CoA requests received................ 183 Number of CoA ACK responses sent............... 75 Number of CoA NAK responses sent............... 6 Number of CoA requests ignored................. 102 Number of CoA missing/unsupported attr reqs.... 0 Number of CoA session context not found reqs... 6 Number of CoA invalid attribute value reqs..... 0 Number of administratively prohibited reqs..... 0 Radius server VSA authentication:.............. Disable RADIUS Attribute 6 Mode........................ Enable RADIUS Attribute 8 Mode........................ Disable RADIUS Attribute 168 Mode...................... Disable RADIUS Attribute 25 Mode....................... Enable RADIUS Attribute 30 MAC Format Value........... unformatted upper-case RADIUS Attribute 31 MAC Format Value........... unformatted upper-case RADIUS Attribute 32 MAC Format Value........... unformatted upper-case RADIUS Attribute 32 Mode....................... Enable RADIUS Attribute 32 format..................... %m RADIUS Attribute 44 Mode....................... Disable Server State................................... Up Server Immortal State.......................... False Test User...................................... Idle Time...................................... 60 Type........................................... Secondary Number of Dead servers in Named Server Group... 0    Running on firmware: Machine Description............... Dell EMC Networking SwitchSystem Model ID................... N2048PMachine Type...................... Dell EMC Networking N2048PSerial Number..................... <-->Manufacturer...................... <-->Burned In MAC Address............. <-->System Object ID.................. <-->SOC Version....................... <-->HW Version........................ 5CPLD Version...................... 20Image File........................ N2000Stdv6.6.3.10Software Capability............... Stack Limit = 8, VLAN Limit = 4093 unit active backup current-active next-active---- ----------- ----------- -------------- --------------1 6.6.3.10 6.6.3.8 6.6.3.10 6.6.3.10   Why is my switch not responding to the CoA packets it receives? 
Dell N2048P / RADIUS CoA: DAC not found. Packet discarded.