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PPTP VPN Connection issues on ESXi 5.5

Issue:  I am unable to connect to a VPN server hosted as a guest on VMware ESXi 5.5. After much troubleshooting it seems that the issue with my PPTP connections is that GRE isn’t making it to my server. In my logs I found the following: vyatta pptpd[2777]: CTRL: PTY read or GRE write failed […]