VPN won’t connect (GRE – 47 issues)

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So long story short I went through all sorts of research to finally find a fix;
Uninstall Symantec.
Well at least the firewall aspect of it anyway. I had been through reams of forums and no one touched on it! So eventually, tonight I had a client that “all of a sudden” couldn’t connect to the VPN. They said that nothing had changed so why did it stop working?
The reason is that Symantec in their infinite wisdom decided that blocking GRE (47) would be a great idea, but let’s let through 1723 just to throw them off the scent…
Thanks Symantec for keeping us on our toes.

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