Unable to connect to pipe \\.\pipe\PSA_pipe

1. Identify which database provider is used to store Parallels Plesk Panel by looking up the value of the HKLM\SOFTWARE\Wow6432Node\Plesk\PSA Config\Config\PLESK_DATABASE_PROVIDER_NAME hive in the system registry:

2. Identify the status of the corresponding service:

C:\>sc query PleskSQLServer

SERVICE_NAME: PleskSQLServer
        TYPE               : 10  WIN32_OWN_PROCESS
        STATE              : 1  STOPPED
        WIN32_EXIT_CODE    : 0  (0x0)
        SERVICE_EXIT_CODE  : 0  (0x0)
        CHECKPOINT         : 0x0
        WAIT_HINT          : 0x0

3. Start it up:

sc start PleskSQLServer