Not sure if anyone suggesed this in the past 30-something replys however, I think it could be the FiOS Router Firewall, in that, if you try to connect a few times then check the FioS Firewall log in the router, it may tell you it is rejecting the connection, if not, then look for one of the many free network sniffers on the web. Download it, install it on a PC, and check its log for a rejection statement in the log. Then Enter in a Firewall rule to open that sorce, and destination IP address, and TCP port, in the FiOS Router. Sounds technincal, but it is simple if you have done it at least once. I have had to put in manual rules to access my localy attached storage server and other devices not allowed in the default allowed list in the FioS router firewall.
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