Meo
2
Presumtion 1:
There are other players besides you two that have no problem connecting.
Presumtion 2:
You are running your server on same machine as client or a machine in your network, the player is not.
Let him check his/hers and you yours antivirus and/or firewall settings/changes/updates.
Change of provider maybe?
This was just brainstorming, to rack brains, please revise my presumtions and provide more info
EDIT: You mentioned Gportal, so my presumtion 2 may not be correct
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