Article ID: 125636, created on May 27, 2015, last review on May 27, 2015

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


Plesk with billing is insalled. Login to admin panel: https://[pleskurl]:8443/sso/ui results in the following error:

Error 'Invalid signature'


Main page https://[plesk_url]:8443 redirects to special sso interface https://[plesk_url]:8443/relay with SAML request, and then, it redirects to https://[plesk_url]:8443/sso/ui, and sets variable signature.

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


Use link https://[plesk_url]:8443 to log in to Plesk.

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Error 'Invalid signature'

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