Symptom
When we are browsing any site hosted on IIS and then we are getting HTTP Error 503 Service Unavailable error.
Cause
Some required IIS components are NOT loading properly. e.g. (The ...
Updated Feb 28, 2023
Version 1.0
Blog Post
2 MIN READ
503 Service Unavailable error (The Module DLL <path-to-DLL> failed to load. The data is the error)
Samyak_Sharma
Microsoft
MicrosoftThanks for the article Sandeep. Here are some other common dll's for which you can see this issue on :
- The Module DLL C:\WINDOWS\System32\inetsrv\urlauthz.dll failed to load. The data is the error. (URL authorization feature)
- The Module DLL C:\WINDOWS\System32\inetsrv\iisreqs.dll failed to load. The data is the error. (Request Monitor feature)
- The Module DLL C:\WINDOWS\System32\inetsrv\authbas.dll failed to load. The data is the error. (Basic authentication feature)