Comodo?
I was about to post saying that I had the same problem when I discovered that I could access my server through port 81 from a remote connection. I disabled my firewall (Comodo) and voila: connection. I then added port 81 to Comodo's port sets and all is well.
I went ahead and posted this mainly because it seems that something changed with Comodo since yesterday as I was able to access through 81 at that time. I assume it's an update as I have not touched any settings in Comodo since the problem started.
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