IIS Admin Service cannot start with error 0x80004015

  Symptom:   IIS Admin Service cannot start. IIS manager shows a blank window. It throws error code 0x80004015, “The class is configured to run as a security id different from the caller”, when starting the service.   Troubleshooting: And error is found in event log when starting IIS admin service. Event Type:        Error Event…

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Troubleshooting Message Queue messages get delayed intermittently

  Symptom: Sometime you may find the MQ messages get delayed intermittently. The delays are about 60 seconds which cause loss of business opportunity.   Troubleshooting: The MQ journal log on the target MQ server shows a delay between the send and arrive time of the delayed messages.   The performance count “MSMQ Service\MSMQ Incoming…

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ASP cannot open encrypted Access 2007 database file via ODBC

  Symptom: To reproduce the issue: 1.        Install “2007 Office System Driver: Data Connectivity Components” in order to open the new Access 2007 .accdb database file. http://www.microsoft.com/downloads/details.aspx?familyid=7554F536-8C28-4598-9B72-EF94E038C891&displaylang=en   2.        Place an .accdb Access 2007 database file on server. The database is password encrypted.   3.        Setup an ODBC system DSN and point it to the…

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Why cannot this ASP.NET application domain be unloaded?

  Symptom: According to the dump file, there are dozens of application domains for one asp.net web application. Troubleshooting: Asp.net starts new appdomain and unloads old one in various scenarios, for example: ·         Machine.Config, Web.Config or Global.asax are modified ·         The bin directory or its contents is modified ·         The number of re-compilations (aspx, ascx…

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Error “setup was unable to load the master information file”

  Symptom: When clicking “Add/Remove Windows Components” in control panel, it shows error “setup was unable to load the master information file” and rejects further action. Troubleshooting: This error occurs when master information file %windir%\inf\sysoc.inf is missing. This can happen when system is restored from an invalid backup or malicious software has deleted important system…

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FTP client application encounters slow file download performance issue.

  Symptom: The FTP client is a .net client application. It invokes wininet.dll to download files from FTP. The application downloads ftp files much slower than FTP.exe and other 3rd party ftp client application. Its speed is  <500kb with a 1000M network link. Troubleshooting: I collect Network Monitor log to begin the troubleshooting. When the…

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