1. Try to log into a different server on that account having issues, then back into the server you're trying to log in now and see if that fixes it.
2. If it doesn't, you might need to wait for the next server restart to purge the issue.
3. I'm guessing the 20 attempts to connect didn't happen in less than 20 seconds? If it very quickly goes from attempt 1 to 20, there's a separate issue at play that's network related (node somewhere between your ISP and DDO that has fallen over) and there is nothing that can be done about this one except to wait for the nodes to rebuild and remap around the issue.
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Actually for 3, there is one other option, you'll need a different online connection or use of a VPN. So a mobile connection or VPN for example would give you different network routing across the net that could bypass the issue - IF it is the issue described (attempts 1 to 20 happen less than 20 seconds, as that means it's not reaching the Game World server in question).
J1NG