3.7.6 to 3.8 /administrator redirects to home

[Wytchcat]

2 sites affected.

Steps to reproduce the issue

Upgrade 3.7.6 to 3.8 via Joomla updater

Expected result

standard login @ /administrator

Actual result

redirected to frontend HOME

System information (as much as possible)

Add-on domaians godaddy shared hosting
PHP 7.0
One Yootheme Pro 1.9.7 with Yootheme's current 3.8 code correction
One Yootheme Warp 7
Multiple 3rd party extensions

Additional comments

On upgrade .htaccess was gone. changed htaccess.txt to correct 406 errors to come to this dilemma.

Interestingly, Yootheme Pro site shows the url ending: /index.php after redirect while the Warp 7 theme still shows the /administrator while displaying the frontend homepage.

[Wytchcat]

Sites affected:

Yootheme Pro v1.9.7
Warp 7 theme

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/18071.}

[ghost]

is this Issue same like #18069?

[Wytchcat]

Possibly? the above gives a 404 error vs just redirecting to the front end.

Separate domains, installs and behavior so started a different tracker

[wojsmol]

@Wytchcat
Yootheme Pro v1.9.7 site - wrong or expired domain.
Warp 7 theme - any security or seo extension there?

[Wytchcat]

RS Firewall on both

[Wytchcat]

All three sites are hosted on same shared hosting as add-ons.

These are in a separate directories. All DNS settings from both domain and hosting sides checked

[Wytchcat]

Behavior caused by IP being blocked by host due to multiple connections.