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Since there are a lot of reasons which may cause server errors, their diagnostics is very complex and tedious.
Thus, everything depends on the server configuration.
It is important to know that the said restrictions are not determined through PHP settings in php.ini.
Normally, such an error and its cause are recorded in server logs. You have to refer to the hoster requiring that the reason of the error be indicated and the error be eliminated (for example, by increasing the resources). If the hoster could not find a solution, please contact Bitrix helpdesk providing an accurate description of the error and the reasons indicated by the hoster. Helpdesk will not be able to assist you without knowing the reason of the error.