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DCOM security problem

Posted on 2001-07-17
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Last Modified: 2010-04-06
I have made a DCOM server. Everything works well when connection from clients that are in the same domain as the server.

I moved my server out of the domain and into its on little workgroup and started my server. When I connect from a machine from within the domain I get a "Interface not supported" errormessage. But if I move that server into the workgroup I have no problem connecting!

I have set the following in DCOMCNFG:

"Default Authentication Level"=none
"Default Impersonation Level"=Anonymous
"Default Access Permissions"=Everyone allowed
"Default Launch Permissions"=Everyone allowed

What the heck is wrong?? I don't want the server in the workgroup to do any security checking.

Thanks.
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Question by:kbb2
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12 Comments
 

Author Comment

by:kbb2
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Might I add the the DCOM server is running as a service using SvComm.
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Expert Comment

by:ziolko
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What kind of OS are server and client ?(WinNT - PDC, BDC, SAS; Win2K, Win9x)?
ziolko.
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by:smurff
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Just a comment but if I were you I would make a simple DCOM server and client (not in a service) and see if you can connect to it. I say this because I think it is to do with system permissions in the NT service.

regards
Smurff
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Author Comment

by:kbb2
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I actually just sorted it out!!

Im using WinNT4 and Win2k.

It seems that I must set the above settings on both the client AND server! The one with the highest security wins. So when setting the client also I connected with no problem!
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Expert Comment

by:ziolko
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kbb2 > yes if You use callbacks, if not I'm not sure
ziolko.
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Author Comment

by:kbb2
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I don't use callbacks but I found two very interesting articles that gave me inspiration:

http://www.codeguru.com/activex/COMSecurity1.html
http://www.codeguru.com/activex/COMSecurity2.html

I guess that the question is closed then!
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Expert Comment

by:ziolko
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Just think some people gave up with DCOM 'cause they couldn't solve problems with security config :-)))
ziolko.
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Author Comment

by:kbb2
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DCOM certainly is very good but can be frustrating sometimes... Very good to have expertsexchange in those cases.
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Expert Comment

by:gutian
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I think if you login with the user his name is same with a domain user and password is the same on the client,it may be right.
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Author Comment

by:kbb2
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No I tried that!! I dont' want any authentication so I switched it off on the server but I just didn't know that you also had to switch it off on the client to!

The hole point is that there are a firewall between them so the machine in front of the firewall can't see the PDC.

But I have no problem anymore!! I love DCOM... Dang nice thing!


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by:Moondancer
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