And yet again I ask, Can SOE please make an effort to stop using incompatible port numbers for zones? Even with my limited knowledge of networking I can see the glaring problems with a lot of the low number port assignments issued to zones.
Its not as bad as it was a few years ago where I _HAD_ to have a backup connection available for when characters got trapped in zones on ISP-blocked ports (the Microsoft SQL server port seemed to be what got me most often). The remaining ones that still seem to be getting used are VoIP-related, I think H.323 (the phone service from my ISP is H.323).
I had a :1900 prevent me access to a raid today. That is for uPnP I believe. In addition I've had: :1718 :1719 :1723 all create issues for me as well. Which, I believe at least one of those is the one you cited. It occurs fairly rare as there is only a few chances out of every 10,000 that it will become an issue, but still just as annoying. When I read through other tech support threads here I see it happening to others too, but they just have no way of understanding what the issue is and nothing ever seems to get resolved.