WCF: Calling WCF service hosted in IIS on the same machine as client throws authentication error

Scenario: A WCF service hosted in IIS that is invoked from another WCF service or ASP.NET application hosted in IIS on the same machine, throws the following error:                 “The HTTP request is unauthorized with client authentication scheme ‘Ntlm’. The authentication header received from the server was ‘Negotiate,NTLM”‘.The key here is that it fails only for local…

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New transaction cannot enlist in the specified transaction coordinator when using Oracle OLE DB provider

SYMPTOMS A COM+ application that uses Oracle 9i fails intermittently on Windows 2003 Service Pack 2. The application logs the follow error in the event log: Event Type:     Error Event Source:  ************ Event Category:          None Event ID:        0 Date:               9/14/2009 Time:               10:46:51 PM User:                N/A Computer:       ************ Description: Error: PID 1160 — CATCHFAILED2 ERROR: 0x8004d00a…

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Event ID 4156 with RPC_S_INVALIDA_ARG is logged intermittently when MSDTC Mutual Authentication is not required

SYMPTOMS  Intermittently MSDTC 4156 error message with RPC_S_INVALIDA_ARG in the event details is logged in the event log when MSDTC is configured with Mutual Authentication not required. Event Type: Error Event Source: MSDTC Event Category: CM Event ID: 4156 Date: 10/29/2009 Time: 4:22:02 PM User: N/A Computer: ********* Description: String message: RPC raised an exception…

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