I have 2 separate TS3 installations, one is running on the default ports (There is a reason for them not being virtual servers on 1 installation)

The default port server has always reported open, but has never accepted file transfers
The other server reported open and accepted file transfers until just recently

No settings were changed and this was pre-update, both servers have been updated but the issue persists

I have tried changing the binds from a specific IP to 0.0.0.0 but neither work
canyouseeme.org claims the default is open but the other isn't, the windows firewall rules on both are the same and have not been changed since I installed the servers

OS is Windows Server 2008 R2
Servers are 3.0.7