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iis 10 0 detailed error 455 0 modsecurity action http error 455 0 modsecurity action the custom error module does not recognize this error most likely causes a module set an infrequently used status code things you can try investigate why the module set the status code detailed error information module modsecurity iis 32bits notification beginrequest handler aspnetcore error code 0x00000000 requested url http nikse dk 80 physical path d web localuser nikse dk public_html logon method not yet determined logon user not yet determined more information any module can call setstatus with the status substatus or hresult the custom error module only displays status specific error messages for well known errors view more information