https://community.cisco.com/t5/network-security/error-authentication-server-not-responding-no-error/m-p/2436710#M1003307 <P>Hello</P><P>&nbsp;</P><P>i upgraded my ASA 5510 with OS 8.2 fail over pair a month back to new ASA 5512 with OS 9.1. Almost all services seems working fine except the authentication of the device itself. My primary node is able to be authentocated via ACS and even the test aaa-server command is giving successful authentication output. when i try from the secondary node or try to access the secondary node via ssh it will not accept the ACS username and password.</P><P>secondary node is giving the following error mesage</P><P>SEDD-PIX# test aaa-server authentication SEDD username cns password 1234<BR />Server IP Address or name: 192.168.190.254<BR />INFO: Attempting Authentication test to IP address &lt;192.168.190.254&gt; (timeout: 10 seconds)<BR />ERROR: Authentication Server not responding: No error<BR />SEDD-PIX# test aaa-server authentication SEDD username cns password 1234<BR />Server IP Address or name: 192.168.190.254<BR />INFO: Attempting Authentication test to IP address &lt;192.168.190.254&gt; (timeout: 10 seconds)<BR />ERROR: Authentication Server not responding: No error</P><P>&nbsp;</P><P>regards</P><P>Najeeb</P> Fri, 21 Feb 2020 13:11:25 GMT najeeb_v 2020-02-21T13:11:25Z https://community.cisco.com/t5/network-security/error-authentication-server-not-responding-no-error/m-p/2436710#M1003307 <P>Hello</P><P>&nbsp;</P><P>i upgraded my ASA 5510 with OS 8.2 fail over pair a month back to new ASA 5512 with OS 9.1. Almost all services seems working fine except the authentication of the device itself. My primary node is able to be authentocated via ACS and even the test aaa-server command is giving successful authentication output. when i try from the secondary node or try to access the secondary node via ssh it will not accept the ACS username and password.</P><P>secondary node is giving the following error mesage</P><P>SEDD-PIX# test aaa-server authentication SEDD username cns password 1234<BR />Server IP Address or name: 192.168.190.254<BR />INFO: Attempting Authentication test to IP address &lt;192.168.190.254&gt; (timeout: 10 seconds)<BR />ERROR: Authentication Server not responding: No error<BR />SEDD-PIX# test aaa-server authentication SEDD username cns password 1234<BR />Server IP Address or name: 192.168.190.254<BR />INFO: Attempting Authentication test to IP address &lt;192.168.190.254&gt; (timeout: 10 seconds)<BR />ERROR: Authentication Server not responding: No error</P><P>&nbsp;</P><P>regards</P><P>Najeeb</P> Fri, 21 Feb 2020 13:11:25 GMT https://community.cisco.com/t5/network-security/error-authentication-server-not-responding-no-error/m-p/2436710#M1003307 najeeb_v 2020-02-21T13:11:25Z