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…


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…


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…


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…


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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