I've just installed the latest release of TeamCity, and I have a problem with the build agent.
It is always in the Disconnected Agents section, with Agent has unregistered (will upgrade) as Inactivity Reason.
I've followed the various posts here and uncommented the debug comments in the config file, I've set the ownAddress field in the properties file. I've tried to run it with the script file instead as a service, but I can't make it work.
I've noticed in the log a strange thing: it downloads some plugins, but it seems it doesn't succeed in copying them in the plugins directory, and then starts to stop and start continuously.
The log file is in attachment, I hope this will help you to find what's wrong
Thanks in advance