A websites running on IIS display the following error message:
HTTP Error 503. The service is unavailable
On attempt to get access to File Manager following error appears:
Error: The unexpected HTTP code '503' was received on the HTTP request to the agent at 'https://203.0.113.2:8443/agent.cgi'.
203.0.113.2- IP address of IIS service node.
In Event Viewer > Windows Logs > Application there is the following error:
The Module DLL C:\Program Files (x86)\iisnode\iisnode.dll failed to load. The data is the error.
Cause of such issue is that Plesk users psaadm and psacln do not have access to
C:\Program Files (x86)\iisnode\ directory by default.
Change the NTFS permissions to the
C:\Program Files (x86)\iisnode as follows:
- Disable inheritance and convert permissions from inherited to explicit.
- Set permissions to read for users psaadm and psacln.