We had a client where a working VPN setup suddenly stopped working with error

“The user OLX\user connected to port VPN2-24 has been disconnected because no network protocols were successfully negotiated.”


We validated telnet to port TCP 1723 was working from outside.
Validated VPN configurations and found them OK
Found some articles where it was asked to switch to static IP Pool, but we were already static.
Checked other misc settings and found something strange,

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An automobile enthusiast at heart and computer geek by profession, started my Career with MS in 2005.Left Jobs and started Pledge Technologies (the parent company to Grishbi) back in 2009.We have been providing IT consulting to various Small and Medium businesses across US and UK since then.Our company specialises in Microsoft Server technologies like AD, Exchange, the rest and with numerous Office 365 migrations under our belt, we quite an expert with that too. Whatever we learn in our day to day life, we share it back on Grishbi as a Thank for all the love and support our customers have given us.