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AR15.COM
12/6/2013 3:18:07 PM EDT
I posted this in urban commando's but no luck.

My windows 7 PC updated itself Tuesday night. I now get this when I try to connect to sonicwall VPN. "the remote session was disconnected because of a decryption error at the server." My IT staff asked if I could try it from another computer. It works from an older XP box. It doesn't work with IE 11, firefox or chrome. Their solution-"use the XP box"

Um no, I'd like to use my PC to remote in and work.
12/6/2013 4:17:30 PM EDT
[#1]
Roll back to a week ago via system restore.
Retest.  Once you can VPN again, manually do windows updates one at a time so that you can identify which one breaks it.
12/8/2013 4:57:22 AM EDT
[#2]
I did the system restore point to the night of the update (Tuesday night). VPN works fine. Definitely something in there that broke the settings or certificate.