Testing using a telnet client to attempt TCP connections reveals the following:
- A remote system cannot connect. The connection appears to be passively
refused.
- The remote system's IP address appears in /var/log/messages with an
'INVALID' message similar to that given above.
- Using telnet from the local system succeeds without issue.
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UFW blocks traffic inappropriately
https://bugs.launchpad.net/bugs/216661
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