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I am using Dell PowerEdge 2950 with NetXtreme II NIC with Windows Server 2008 (not R2). It was working perfectly. I enabled RemoetApp, created RDP, also enabled Remote Desktop to allow our users to connect from anywhere. Good thing is it is still in testing environment. I didn’t have any security software installed on it so I proceeded to install whatever I had available to me which was Symantec EndPoint 64 bit edition for Windows Server 2008.
Sure enough like any other installation, the installation process went well. I ran live update with no hitch. Then it asked me to reboot. After that, I started to get the following error:
“Because of an error in data encryption, this session will end. Please try connecting to the remote computer again.” – Just like the screen shot below.

Encryption Error after installing Symantec EndPoint on Windows Server 2008

As soon as you press ok, it just closes the program. I tried it with RemoteApps, Remote Desktops and also using the RDP clients I created for each program. Trying to locate information, I came across many useful hints but mostly about Windows Server 2003.
I tried to change registry keys but none of them worked for me. If you want to try those solutions go ahead but please know that it may inadvertently cause some other issues. Then I found another solution that I wanted to try which basically talks about “Large Send Offload on IPv4.” This was a unique solution because I thought it was brilliant. So I followed the following steps:
1. Went to the server room (because I can’t connect remotely even as administrator)
2. Logged onto the Server.
3. Then find your active “Local Area Connection Status” window.
4. Click on Properties
5. Click on Advanced tab and you will see something like the screen shot below:

6.   Select Large Send Offload v2 (IPv4) and on the Value field select disable just like the screen shot below:

Encryption Error Solution

Press ok and you should be back in business.

Hope this helps.

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