On October 19, 2021, we have enabled single-sign-on for our Plesk Support Center to provide a seamless login/account experience. This implies that you’ll be able to use a single account across any of our web-facing properties.
If you had already registered your account at Plesk 360 (formerly known as My Plesk) please use one for login. Otherwise please re-register it using the same email address as your existing Zendesk login (support account). It’s essential that you use the same email address on our support center to ensure that your tickets stay attached to the same account.

Unable to access to Plesk under admin: Another user with the same username (admin) is already logged in to Plesk

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    Trilema Internet

    Doesn't worked to me. I had to restart the server.

    I am using Windows and Plesk Onyx 17.5.3

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    Vitaly Zhidkov

    @Trilema, this means that someone has logged in as soon as service was restarted

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