Plesk is inaccessible: Unable to connect to pipe \\.\pipe

Symptoms

• Plesk is inaccessible with the following error:

  CONFIG_TEXT: ERROR: Exception: Unable to get administrator password: The system cannot find the file specified. (Error code 2) at Unable to connect to pipe \\.\pipe\

• In Windows Event Viewer, the following error appears in Plesk section:

  CONFIG_TEXT: Unhandled exception
  E06D7363
  Execute file name: C:\Program Files (x86)\Parallels\Plesk\admin\bin\plesksrv.exe

• Plesk Management Service is being restarted endlessly

• Task manager shows that Parallels.MonitorSrv.exe process consumes a lot of memory

Cause

This is Plesk bug with ID #PPP-28421 . It was fixed in Plesk Onyx 17.5 MU#4.

Resolution

As a workaround, terminate Parallels.MonitorSrv.exe process.

For Plesk Onyx 17.5, install the latest Plesk micro-updates .

For Plesk Onyx 17.0 and earlier Plesk versions, consider upgrading to the latest Plesk version.