WAAS and Microsoft Remote Assistance

Unanswered Question
Sep 25th, 2008


My customer has an isse with WAAS and XP remote assistance. If they try it via IP address it works fine but via hostname it fails. Doing some investigation reveals that the two methods use different bind calls.

When using IP address to do the RPC bind

RPC: c/o Bind: UUID{000001A0-0000-0000-C000-000000000046}


The auth type used is

Auth Type = 0A (RPC_C_AUTHN_WINNT - NT LAN Manager Security Support

Provider NTLM SSP).

This works

When a hostname is specified the auth

type used is

Auth Type = 09 (RPC_C_AUTHN_GSS_NEGOTIATE - Negotiates between the use

of the NTLM and Kerberos protocol SSP)

This fails.

A simialr thing seems to be affecting Microsoft SMS which again uses RPC.

They are using WAAS 4.1.1



I have this problem too.
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Zach Seils Fri, 09/26/2008 - 21:44


Doesn't the Remote Assistance feature use RDP? What is the failure message you are seeing? What is the connection state (sh stat conn all) in WAAS?



Patrick Colbeck Sat, 09/27/2008 - 04:17

Yes it does use RDP but it's not getting that far so far as I can see. Its failing to authenticate which it does before RPC binds RDP.

The customer has now logged this with TAC so I won't pursue it here. Thanks for replying though. I will post a summary of the solution when we have one so that if anyone searches for a similar problem they get an answer.

Zach Seils Mon, 09/29/2008 - 08:32

Hi Pat,

Just heard back from Engineering that they think this is bug CSCsu65835. Please follow through with your TAC case.



Patrick Colbeck Wed, 10/01/2008 - 04:04

Thanks Zach I have passed this on to my customer. That looks like their issue and they are waiting for a release in which it is fixed.



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