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

Symptoms

1. Plesk is not accessible:

   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\

2. In Event Viewer > Plesk, the following error appears:

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

3. services.msc shows that Plesk Management Service is being restarted, endlessly.

4. 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

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.

As a workaround, kill Parallels.MonitorSrv.exe process using Task Manager.