Unable to access computers remotely with TeamViewer on UVerse GigaPower service
I use TeamViewer to remotely access computers connected to my UVerse GigaPower gateway, either by ethernet or WiFi. This worked perfectly fine on Sunday. On Monday, I found I could no longer access any device that is behind my UVerse Gateway. The devices still appear online, but if I try to access them, I receive an error message: "Unable to connect. A connection could not be established. Partner could not be contacted at the given network address."
According to TeamViewer, as long as you can 'browse the internet', you should be able to use TeamViewer. Nothing changed on the devices, so I can only assume there is either an issue with the Gateway, or AT&T has for some reason blocked this service.
When I contacted support via chat, I was escalated to advance support, only to be told I would have to pay for a service subscription to have the issue fixed. So AT&T or their equipment begins to block a commonly-used service, and I'm told I have to pay to get it fixed.
Any suggestions, short of switching to google fiber when it comes available in my area in a few months? I've only had this GigaPower service for about a month, and this isn't making the best 'first impression'. I've been on various types of UVerse service for years without experiencing this type of issue.