Do you get any errors showing in the server console at all or in the logs?
Do you disconnect no matter what map you are running?
Does it show in the RO2 server browser?
What server version is it as it should be GameVersion=1.1.0.4..
Look in your ROEngine.ini to confirm this.
If not this version then your server is out of date.
In any case I would be tempted to scrape the current files and try a clean install with new files downloaded from SteamCMD
Hope this helps