EEM is up and running with no errors, however; ServiceDesk eem authentication users can't login into SD, and logs show the following error:
01/03 10:36:55.25 CASD1234 bopauth_nxd 3920 ERROR eiamAuth.c 457 Error authenticating user: 'xxxx' - EE_AUTHFAILED Authentication FailedISP_ERROR_NOGATEWAY igateway not running
One of solution that you may come across with the wrong eem hostname as per: TEC616040
However, if that tech document checks out to be correct. The other possible cause is igateway port is blocked or changed. The default igateway port is 5250. On the eem side you can review igateway.conf to see the port is changed or not. If it changed or not, please review from ServiceDesk server the port is open. You can run a simple telnet test from ServiceDesk server pinging the eem server with the igateway port.
from ServiceDesk server command line
telnet EEM_SEREVER_IPS_ADDRESS igateway_port
telnet 128.xxx.1.23 5250
If it returns with blank screen, the connection is successful. If it returns with the following message:
"Connecting to 128.xxx.1.23....Could not open connection to the host on port 5250: Connect Failed"
This means connection could not be established with the provided port. This can be cause of firewall or the port not open. Thus causing the above error in ServiceDesk.