Unable to log in to Plesk: "The page isn't redirecting properly" or "ERR_TOO_MANY_REDIRECTS"

Symptoms

• When opening Plesk in a web-browser, the page fails to load with one of the following error messages:

  PLESK_INFO: The page isn't redirecting properly

  ---

  PLESK_INFO: This page isn’t working 203.0.113.2 redirected you too many times.
  Try clearing your cookies.
  ERR_TOO_MANY_REDIRECTS

• The following error message appears in /var/log/plesk/panel.log:

  CONFIG_TEXT: ERR [panel] PleskObjectNotFoundException: Unable to find service node for ip address with id=2
  file: /opt/psa/admin/plib/Db/Table/Broker/ServiceNodes.php

Cause

Inconsistency in the Plesk database: the psa.IpAddressesCollections table has invalid records:

# plesk repair db -n -v
...
Checking the consistency of the Plesk database

Inconsistency in the table 'IpAddressesCollections' for the column
ipAddressId: No rows in the table 'IP_Addresses' with id = 2 (28
broken references) ................................................ [WARNING]

Broken references in table 'IpAddressesCollections':
*************************** 1. row ***************************
ipCollectionId: 11
ipAddressId: 2
*************************** 2. row ***************************
ipCollectionId: 12
ipAddressId: 2
*************************** 3. row ***************************
ipCollectionId: 15
ipAddressId: 2
...

Resolution

1. Connect to the Plesk server via SSH.

2. Repair the Plesk database:

   # plesk repair db -y