Thanks for the help everyone. The discussions certainly explain some of the
errors I am seeing. Although I was mainly seeing failed RPC call type of
errors it seems that all these things are somehow related. The solution
seems to be to just try registering the callback hundreds of times until it
works, and making sure that the latest service packs are on each machine.

I also found a problem in my code which seems to be related. In the course
of tracking this problem I had also moved my callback object into a seperate
executable. This was for performance reasons (harder to get a hung client)
and to work around another known DCOM bug. I have since moved the callback
back into my main client executable. Stability is greatly improved as a
result of this. There are known problems with callbacks in seperate
executable on 9x machines, and although we had done the fixes for these
probably point to some broad underlying problems with DCOM in this area.

My main unresolved problem is that I am still seeing a *HANG* on some Win98
machines. It is possible to reproduce this very easily.
1) Register a callback with the server. This works fine and returns no
error codes.
2) Move the Windows taskbar (or resize it) shortly after doing this.
3) The Windows task bar is now effectively dead. It may come back after
10-20 seconds, or it may die forever. Other apps seems to run OK.
4) If this happens on a machine, it will *ALWAYS* happen on the machine. I
have installed every service patch and upgrade including all the IE
varitions on the 98 machines in question but nothing helps.

Taco.

-----Original Message-----
From: Steve Aubin [mailto:saubinLOADXPERT.COM]
Sent: Tuesday, August 07, 2001 7:36 AM
To: DCOMDISCUSS.MICROSOFT.COM
Subject: Re: [DCOM] Problems with Callbacks on Win9X

Hi,

If you search the archives for "implementation of callback causing problems
on Windows98" you will find some information that may apply to you.

I know there is a hotfix that you can obtain from Microsoft that fixes this
problem (Q278046). Search the archive for Q278046 and you should get the
info on the hotfix.

Good luck!

Steve.

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