Reply To: Root and wp-admin htaccess File Significant Changes

All this time I’ve deleted root htaccess file via FTP cause is the only way to login again in case of 500 Internal Server Error.
But you are right about having invalid/bad code somewhere or it was a problem with browser cache … cause no matter what was doing …
I figured that the lines of code from current root .htaccess file in htaccess File Editor was different then the same lines in file on other 3 sites [another server]. So doing all that steps described by you but from another browser helped.
Now its ok. Thank you!
Please tell me which should be the right result checking by making a HEAD Request @ System info > Website Headers Check Tool cause i have 2 different situation at 4 diff.sites:
only one site generated 404:

HTTP/1.1 404 Not Found
Date: Wed, 03 Feb 2016 20:36:16 GMT
Server: Apache/2.4.9 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4 mod_fcgid/2.3.9
Content-Type: text/html; charset=iso-8859-1

and other 3 generated 500:

HTTP/1.1 500 Internal Server Error
Date: Wed, 03 Feb 2016 20:39:35 GMT
Server: Apache/2.4.12 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4 mod_fcgid/2.3.9
Connection: close
Content-Type: text/html; charset=iso-8859-1