Why does a 502 error appear in the directory if I log in as admin?

Question

1C-Bitrix

Such a problem. When you are on the site under the administrator, it is impossible to enter the directory. Error 502. If you log out of the account, everything works fine.

Answer 1

An error in the code.
Most likely under the administrator there is some kind of selection.
Or the selections on the site are too heavy, when you log in as an unauthorized user, you are given a page from the composite cache, i.e. there are no queries to the database.
And when you enter under the administrator requests drop the server.