Question : Problem: data encryption disconnect from MS Terminal Server 2003

We have 2 Windows 2003 Terminal Servers that are loadbalanced using 2XLoadBalancer. We run a call center where users log on to TS to get their work desktop. Recently they have been getting the error: "Because of an error in data encryption, this session will end." They are able to reconnect to the disconnected session. This problem occurrs randomly. Microsoft (and others) suggest deleting certain registry keys under : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\TermService\Parameters the Certificate, x509 Certificate and x509 Certificate ID.  We did this, and following other MS articles, deleted the MSLicensing registry key from the clients and deactivated and reactivated the Teminal Services Licensing server using the telephone method (in order to get a completely new activation key).

This morning we found that the problem persists.

In the Terminal Services Configuration mmc the security layer is RDP Security Layer and the Encryption lever is Client Compatable

Has anyone seen and succefully solved this problem? Client computers are Windows 2000 Pro running RDP 5.1

Answer : Problem: data encryption disconnect from MS Terminal Server 2003

Here is the answer I have found.   I started thinking about network transmission problems rather than protocol issues.  We had bought a new machine to be the 2XLoadbalancer. It came with a Realtek RTL8169.8110 Gigabit Ethernet NIC.  I went to the card's advanced properties and disabled 802.1Q/1p VLAN Tagging, Offload Checksum and Offload TCP_Large Send.  I don't know what these things actually do, but I had found articles describing problems people had with intermittent network failures.  I also set the Link speed down to 100Mbps/Full Duplex because the workstations all are 100Mpb as are the switches to which they are connected (even though the 2X machine is in an unmanaged 1000Mbp switch).  Since making these changes we have not received the encryption error.