ERROR CODE 521 Cant login

Dear Sir or Madam,
I have installed a plugin on my website (WordPress Maintenance Mode) since then I have the error code 521.
I can no longer log into my website.
What can i do?
Please help me further.

Thanks.
Best regards,
Martin

May I ask which steps have you tried for troubleshooting 521 error from the article below so far? :thinking:

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