[SOLVED] Linux Client won't connect. "Socket has error 111"

I’m running with debug logs enable on both the server and the client. The server doesn’t say anything. The client only gives the following output:

2016-09-26 08:40:19: urbackupserver: Server started up successfully!
2016-09-26 08:40:19: FileSrv: Server started up successfully
2016-09-26 08:40:19: Started UrBackupClient Backend…
2016-09-26 08:40:20: Looking for old Sessions… 0 sessions
2016-09-26 08:40:21: Trying to connect to internet server “http://backups.example.com/” at port 55415
2016-09-26 08:40:21: Socket has error: 111
2016-09-26 08:40:21: Connecting failed.

The server in question where I am running the client worked before. But because of some bugs in urbackup I decided to remove the client and reinstall. Since then I can’t connect on any server where I removed the client from the webui and reinstalled the client on the server.

What could be causing this? Is there any way to really properly completely wipe urbackup off of a system?
I tried using find to search for any reference to files and directories containing the string “urbackup” and delete those from my clients.

For some reason, I have one client which works. That one is so far the only that works.
How can I debug this further, or are there any files where urbackup stores information on clients that I could edit or delete?

Should be backups.example.com without the http://

D’oh!

Strange, how did I manage to get that in there?
Since my usual workflow is to add a client via the webui and then copy&paste the bash command that’s listed to get directly download a preconfigured client.

Oh well.

Thanks.