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(Beacuse of an error in data encryption) and (The Trust Relationship between this ws)

I have a server 2008 dc been running great for several years with win 7 pro and xp pro machines joined to it.  several employees connect to the office with a standard windows vpn connection to the server, with their home pc's and then remote desktop to a computer and work from out of state.  

lately the vpn connection has been working great the users can connect no problem but when the use the remote desktop to their pc at the office some are getting

"Beacuse of and error in data encryption, this session will end, Please try connecting to the remote computer again"

or

"The Trust relationship between this workstation and the primary Domain failed"

ive read several articles so far cant find a solution.  one article told me to change the mtu setting in my router to get rid of the encryption problem and it worked for serveral days and is back dont know if changing it was just a ramdom.
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dbaideme

VPN software up to date on both ends?

Did you modify MTU on home PC as well as their office PC?
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ASKER

vpn software is just going to ie and connections tab and create vpn connection, nothing fancy.

the only mtu setting i changed was in the linksys router at the office.  didnt know i was supposed to change setting on the pc. if so how do i do that?
You will likely have to change in the registry. Here are examples.
http://www.pctools.com/guides/registry/detail/280/
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