• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
    If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
  • We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.

None of the authentication methods supported by this client are supported error

jj05

Basic Pleskian
In the last few days I've had complaints from clients that they can't send out email. It used to work fine before, but it probably broke on one of the latest updates.

They get the following error message on their Outlook: "None of the authentication methods supported by this client are supported by your server"

I've found a solution on http://kb.parallels.com/en/114417 . It doesn't say that it applies to Plesk 11.5, but it does.

You'd should check if there was a regression in one of the latest releases, and change the default setting to allow non-TLS connections, and add an option in the Plesk interface to force SSL if needed.
 
Last edited:
Back
Top