I’ve got an issue with a newly installed Window 2008 R2 Remote Desktop Server. While RDP’d in, frequently at random intervals the connection is interrupted, “Reconnecting. The connection has been lost. Attempting to reconnect to your session…” That will tick to the 3rd or 4th connection and then reconnect.
This is a guest on a 3 host (Dell R510) Citrix XenServer 5.6 FP1 Pool with HA (Equalogic 4000 iscsi SAN). Each host has a bonded LAN connected to redundant Dell PC 6224 switches.
To troubleshoot so far:
-I’ve confirmed this will happen over LAN or WAN, from windows 7 or XP
-run netsh interface tcp set global autotuning=disabled on both the workstation and server
-Verfied Xentools are installed and up to date for the version of Xen it’s running; reinstalled xentools
-Disabled all offload options on the NIC driver. Since it’s a guest, there is no “allow power off” option
-Migrated the guest to another host in the pool; no other machines have connection issues
-run a continuous ping to the server while connected, nothing is dropped although the interval may not be quick enough.
-VNC’d into it, with a concurrent RDP connection. Both are dropped at the same time.
The last note makes me think that it’s something at the network level, but it’s contradictory that it would only effect this one guest. Any thoughts on what to check next?