topic ACS tacacs authentication faild in Network Access Control https://community.cisco.com/t5/network-access-control/acs-tacacs-authentication-faild/m-p/1949803#M169169 <HTML><HEAD></HEAD><BODY><P>can you telnet to port tcp 49 from the LAN switches?</P><P></P><P>telnet <ACS ip=""> 49</ACS></P><P></P><P>If you see that port tcp 49 is open then try to capture the following debugs:</P><P></P><P>debug tacacs</P><P>debug aaa authentication</P><P></P><P>Regards,</P><P>Jatin</P></BODY></HTML> Thu, 28 Jun 2012 15:32:31 GMT Jatin Katyal 2012-06-28T15:32:31Z ACS tacacs authentication faild https://community.cisco.com/t5/network-access-control/acs-tacacs-authentication-faild/m-p/1949802#M169168 <P>hi&nbsp; ,</P><P>we have a ACS server V4 installed on W2003 server ,when we make a telnet to an equipement on the wan the authentication pass on the first </P><P></P><P>connexion ,but when we telent to a switch on the lan the first connxion fails and we need to retry to login .</P><P>when i check the&nbsp; field attempt log on the ACS i dont find the field attempt.</P><P>i find this issue in ALL switch on the LAN ,from the switch i can ping the the ACS server .this problem appear frequently </P> Mon, 11 Mar 2019 02:15:07 GMT https://community.cisco.com/t5/network-access-control/acs-tacacs-authentication-faild/m-p/1949802#M169168 ybelkassem 2019-03-11T02:15:07Z ACS tacacs authentication faild https://community.cisco.com/t5/network-access-control/acs-tacacs-authentication-faild/m-p/1949803#M169169 <HTML><HEAD></HEAD><BODY><P>can you telnet to port tcp 49 from the LAN switches?</P><P></P><P>telnet <ACS ip=""> 49</ACS></P><P></P><P>If you see that port tcp 49 is open then try to capture the following debugs:</P><P></P><P>debug tacacs</P><P>debug aaa authentication</P><P></P><P>Regards,</P><P>Jatin</P></BODY></HTML> Thu, 28 Jun 2012 15:32:31 GMT https://community.cisco.com/t5/network-access-control/acs-tacacs-authentication-faild/m-p/1949803#M169169 Jatin Katyal 2012-06-28T15:32:31Z