Win XP remote Assistance

[Guest flowjock]

I have set up remote assistance such that from one computer (A or others) I

can remote connect to either of 2 other computers (B and C). The invitation

is a file in a shared folder on my server (the server is not A, B, or C).

There is a separate invitation for B and C. These both worked fine for a

couple weeks. Between A and C still works fine. However, when I try to

remote connect between A and B it takes a long time (compared to connecting

to C) and when the remote connection finally opens I get a windows login

screen (this does not happen on A-c connection). As far as I can tell B and

C are set up identically. I have checked that remote assistance is enabled

(also checked Firewall). All computers are running WinXP Pro SP3. It was

suggested to me the problem was due to that on B I needed to turn on the

"DontDisplayLastUserName" in the registry - tried this did not resolve (it

was not turned on on C). Regardless of which user I log onto B as and also

which user creates the invitation (I have remade the invitation multiple

times) I get the same logon window and the user name shown is always the same

and is the username that was logged onto B when the original invitation was

made a couple weeks ago (this invitation as I said worked for a while). I

would appreciate any ideas before I move to VNC or something else. Thanks

for your help.