RDP connection Error - Cache bitmap



When trying to use the Windows XP RDP Connection to a Windows 2003 Terminal
Server in user mode most clients can connect, except one computer. The server
and computer has installed all available hotfixes and service packs. The
connection is made through Netscreen VPN software. Ping and telnet to the RDP
port is allowed and tested.

When pressing the connect button, the client creates a new windows as usual
when trying to connect. This windows is all black, and no mousepointer is
shown in the window. After aprox. 60 seconds the error "A network error
occured. Try to connect to the Terminl Server again." appears, and the
connection is broken.

When the connection is made with "Cache bitmaps" un-selected, the connection

Does anybody have any idea why this happens?

Vera Noest [MVP]

Strange problem!
I would start to empty the cache in the client. Probably somewhere

C:\Documents and Settings\%username%\Local Settings\Application
Data\Microsoft\Terminal Server Client\Cache


HI Vera

thanks I was having that exact problem as well

couldnt figure it out either, It only happened on this one pc, Compaq laptop
windows xp pro sp2 already installed, Nothing had been installed and was
working fine about 1 month

I checked other clients and they had multiple cahce files (bcache2.bmc,
bcache22.bmc), but the problematic client only had one

no idea - user was a local administer, nothing had been installed and all
apps worked fine, had all the latest drivers, hotfixes, etc, thos laptop had
a clean install of windows xp pro with sp2 about 1 month ago


Thanks for the quick response. Unfortunatly this did not resolve the problem.
If you have any more ideas, please share them. We have been troubleshooting
routers, ADSL modems, routers, software, laptop hardware and more.

I'm at my wit's end with this one...

Geir Thomas Nordskog
MCSE: Security, MCSE: Messaging, CCAI, CCNA, CCDA

Vera Noest [MVP]

This is a long shot, but try this:

From the Microsofts Terminal Services FAQ

Q. Sometimes when I connect to my terminal server, I see a black
screen. Why does this occur?

A. This typically occurs if there is a device between the client
and the server that is receiving packets but not passing them on.
One way around this problem is to change the MTU size for the
network adapter that is being used as a terminal server connection
to clients.


Vera Noest
MCSE,CCEA, Microsoft MVP - Terminal Server
*----------- Please reply in newsgroup -------------*
Jun 24, 2009
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We are having this issue also. Our work around is to delete the bcach22.bmc file first then the user is prompted to login. I also noticed on the machines where it is working there are two cache files. For whatever reason it is not allowing the cace file to grow. So once they log off, they cannot log back on unless they delete the cache file. Any ideas?

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