Can not help, since it's related to your hosting service.
Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. -
Professional support
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Plugins, theme and development
. I don't answer to private message.
Ok, now it is clearer what the actual problem is, because I (and I think Denis as well) read your problem as:
"I can access the platform without having to login."
Actually, your problem is "just" that you can't login, correct? You se the login mask, you can put your login data and when you submit, you get a 504 Gateway timeout.
What confuses me is that you say it is on your own server, but you can't get access to the PHP logs? Because this seems to be a server issue to me.
You need to speak to the person responsible for your Limesurvey installation in your organization.
I answer at the LimeSurvey forum in my spare time, I'm not a LimeSurvey GmbH employee.
No support via private message.
