Like i already said that Error Code 524 indicates a Timeout. Maybe the Webserver received the Request and was unable to complete it in Time. That you can access the Website in a Browser where you are logged out indicates that you are not Blocked but the Website Fails to Complete the Request in Time when you are logged in. There can be many Reasons for this to happen, like a broken Database Lookup. What exactly the Problem for this i can only the Website Owner tell you. Try to contact them.
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