Good evening, I have a big problem
I'm a beginner with LiveSurvey so I have to understand what happened. I have not done anything lately suddenly started to give me error when I try to access the backend at the address with / admin ..... which becomes after I enter /index.php/admin/authentication/sa/login. The error is 500 as if the page did not exist. I do not know if there was any automatic update I'm still not good on the software.
Can you help me understand the problem? Why can not I log in? The version is v2.06 +.

Thanks

The error is 500 as if the page did not exist.

The http error 500 does not mean that the page does not exist, that would be a 404 ( en.wikipedia.org/wiki/List_of_HTTP_status_codes ).

500 means internal server error and is not very specific. Unfortunately, with the information provided, it is almost impossible to help. Limesurvey does not update automatically. Even with the ComfortUpdate updates need to be started by the limesurvey superadmin.

So my guess is that your server software (OS, webserver, database, etc.) have been updated. You should get in touch with the server admin.

Does anyone else have access to your Limesurvey installation as a superadmin?

How to access from superadmin? What can I do if I can not reach the backend login page?
Excuse me but I'm really new to Limesurvey I do not understand what problem can be if everything works and I can not reach only the login page.
Can you please tell me how I can understand? Do you have any idea?
Thanks for the support.

Well, with the information that you are currently providing, it is close to impossible to help.
If it worked before, there needs to have been some kind of change. Either someone did something in Limesurvey (which is why I asked if there are other users with Superadmin rights), which I don't find very likely. Or there has been made changes to the webserver environment, e.g. update in the OS, PHP version updated, etc.