We implemented Siebel 8.0.3 with LDAP Security Authentication.
From today morning when we are trying to logging in with thin client its showing that ' the server you are trying is either busy or experience difficulties', then i tried to logging in through dedicated web client i logged in to client and then i saw that object manager is in 'Handshake-failed' state. In log file its showing the below error.
"(smilobj.cpp (958) err=1376305 sys=851969) SBL-SMI-00049: Internal: There is no connection to the gateway server"
I know this is old but i just thought id add the information incase anyone else is looking.
This is an issue of the Gateway not being able to authenticate to the LDAP server. I would check if the LDAP Server is working, secondly that the gateway server can access it. Thirdly, that the application user used during setup of LDAP Authentication still exists or its password has not changed.
After you can verify all of that, please restart your servers.