RDP sessions broken

[Guest AndiK]

We have 5 Windows Server 2003 Enterprise Edition in a wlbs cluster with

clustered session directory serving about 250 users with thin clients. Each

Server has to network interfaces, one inside the wlbs cluster, the other

intended for backend traffic.

Most of the thin clients are Wyse Thin OS devices (S10 and Winterm 1200LE)

with "legacy" rdp clients. Clients and Servers are on our inhouse LAN (Cisco

switches 1GBit/s Backbone, 100MBit/s at the client side).

Some users with that Wyse Thin Clients experience suddenly broken rdp

connections, sometimes only once or twice a day, on other days 3 or four

times in 5 minutes. I suppose that some users, even though affected, don't

know about the problem due to the reconnect feature of the tc devices and the

session directory.

Devices with microsoft rdp clients (5.2 and 6.0 on XPe Thin Clients and XP

Workstations) work without any losses of rdp connections.

I tried a lot of different workarounds and settings but cannot fix this

issue. Is there anyone outside who experiences similar problems or does

anyone have an idea how to fix this issue?

 

Best regards

 

Andi

[Guest AndiK]

RE: RDP sessions broken

 

Not the solution (i hope that our LAN Division will provide one :-), but an

effective workaround in my case was setting TcpMaxDataRetransmissions to

10(dez).

 

<Quote>

In the registry at HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters,

create or edit the DWORD value of TcpMaxDataRetransmissions. By default it is

set to 5, but I would recommend doubling that value, to 10. The value of

TcpMaxDataRetransmissions is the number of times TCP retransmits an

unacknowledged data segment on an existing connection. TCP retransmits data

segments until they are acknowledged or until this value expires. Basically,

when a client doesn't respond to a packet from the terminal server, the

server will attempt to retransmit the packet up to TcpMaxDataRetransmissions

number of times. By increasing this value, you are giving the client more

time to respond to the server, which will help improve flaky connections or

connections with high latency or higher than normal packet loss.

</Quote>

 

"AndiK" wrote:

> We have 5 Windows Server 2003 Enterprise Edition in a wlbs cluster with

> clustered session directory serving about 250 users with thin clients. Each

> Server has to network interfaces, one inside the wlbs cluster, the other

> intended for backend traffic.

> Most of the thin clients are Wyse Thin OS devices (S10 and Winterm 1200LE)

> with "legacy" rdp clients. Clients and Servers are on our inhouse LAN (Cisco

> switches 1GBit/s Backbone, 100MBit/s at the client side).

> Some users with that Wyse Thin Clients experience suddenly broken rdp

> connections, sometimes only once or twice a day, on other days 3 or four

> times in 5 minutes. I suppose that some users, even though affected, don't

> know about the problem due to the reconnect feature of the tc devices and the

> session directory.

> Devices with microsoft rdp clients (5.2 and 6.0 on XPe Thin Clients and XP

> Workstations) work without any losses of rdp connections.

> I tried a lot of different workarounds and settings but cannot fix this

> issue. Is there anyone outside who experiences similar problems or does

> anyone have an idea how to fix this issue?

>

> Best regards

>

> Andi