- Plesk Onyx for Windows
MailEnable webmail shows 503 Service Unavailable.
MailEnableAppPoolapplication pool crashes on attempt to access webmail.example.com.
Event Viewer shows events with ID 2280 and 5139 five times in a row. After that Event with ID 5002 appears and the application pool is stopped:
Event ID 2280:
PLESK_INFO: The Module DLL C:\Windows\System32\inetsrv\ModSecurityIIS.dll failed to load. The data is the error.
Event ID 5139:
PLESK_INFO: A listener channel for protocol 'http' in worker process '12864' serving application pool 'MailEnableAppPool' reported a listener channel failure. The data field contains the error number.
Event ID 5002:
PLESK_INFO: Application pool 'MailEnableAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
Switching the option Enable 32-Bit Applications toTrue value in IIS > Application Pools > MailEnableAppPool > Advanced Settings works around the issue:
ModSecurityIIS.dll module cannot be loaded due to missing several Microsoft Visual C++ Redistributables with x64 architecture, e.g.
Connect to the server using RDP.
Install/reinstall all the packages
vcredistXXX_x64available in the folder
MailEnableAppPoolapplication pool in IIS Manager > Application Pools > MailEnableAppPool > Stop/Start: