Article ID: 125351, created on Apr 30, 2015, last review on Oct 9, 2016

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.5 for Linux


An error appears upon Plesk login:

Invalid signature


This is Plesk internal issue with ID #PPPM-1223 which is expected to be fixed in future product updates.


Please try to use one of the following workarounds:

  1. Disable SSO integration if Plesk Billing (CBM) is not used:

    # /usr/local/psa/bin/sso -d
  2. Simply refresh the page (by pressing F5 key)

  3. Repair Plesk - CBM integration:

    # /usr/share/plesk-billing/integration --command= repair-all

Alternatively, upgrade to the latest Plesk version.

Search Words

signature is empty

Invalid signature


Error Invalid signature. on start screen [P1]

Invalid Signature

ERR [sso] [SSOApiHandler::handleUI] Invalid signature: signature is empty

ERR [panel] No data

a914db3fdc7a53ddcfd1b2db8f5a1b9c 56797cefb1efc9130f7c48a7d1db0f0c 29d1e90fd304f01e6420fbe60f66f838 01bc4c8cf5b7f01f815a7ada004154a2 0a53c5a9ca65a74d37ef5c5eaeb55d7f 2a5151f57629129e26ff206d171fbb5f e335d9adf7edffca6a8af8039031a4c7

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