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That should be working as intended. (showing in gray for wrong versions) If I ran WoTLK authserver (for 335a and 434) and connected via Cata client it would show 335a servers offline and vise versa when I connected with the Wrath Client showing the 434 servers offline.

Are you trying to access WotLK with a CATA client?

Yes, but you still need to add your second realm to the authserver.conf so it'll know it's available. Fill it in just like you did for the first one, only this time use the info for your second realm.

What I've done in the past was use only WotLK's authserver, set both realms in the conf file, then in the database auth, realmlist table add one for CATA using the port and IP number of your CATA server. Be sure to change the gamebuild table to reflect CATA's gamebuild. When your finished you should have a listing for both WotLK and CATA. That realmlist table has all the info to connect to the second server already in it, and the gamebuild will put you into the correct server. This eliminated the need to try and run 2 authservers for me, pehaps it'll help you as well.