Magento2 Backend, gives redirect loop

[santrooper]

System Details

host :: http://dev.magento_2.nl [Apache Virtual Host]
PHP Version 5.6.15-1+deb.sury.org~trusty+1
System Linux Elsha 3.13.0-68-generic #111-Ubuntu SMP Fri Nov 6 18:17:06 UTC 2015 x86_64
Server API Apache 2.0 Handler
Browser :: Mozilla Firefox for Ubuntu ver 42.0 [All cache enabled]

Issue

Magento2 installed with sample data [full].
Magento2 Frontend, Works fine. [Url :: http://dev.magento_2.nl]
Magento2 Backend, gives redirect loop. [Url :: http://dev.magento_2.nl/mg2admin]

Tried to debug, with following results.

File @ :: "vendor/magento/module-backend/Controller/Adminhtml/Auth/Login.php"

Method :: public function execute()...

Line :: return $this->getRedirect($backendUrl);

causes infianite redirect.

File @ :: "vendor/magento/framework/Controller/Result/Redirect.php"

Method :: public function setPath($path, array $params = [])....

$path = 'http://dev.magento_2.nl/mg2admin/admin/index/index/key/d13fc6c95465f4b9f86eb2734f8aeb985652c2bea2ebacbd39791550536f57e2/';

$params = [];

$this->url = $this->urlBuilder->getUrl($path, $this->redirect->updatePathParams($params));

/*
Returned URL :: http://dev.magento_2.nl/mg2admin/http:/index/dev.magento_2.nl/mg2admin/admin/index/index/key/e667989087990866ee28bb69b7d4d81c05f23964b0da418afd646f2ceff1b49d/
*/

[daim2k5]

Has hopefully nothing todo with your bug but dev.magento_2.nl is not a valid domain name

[santrooper]

Thanks for the reply,
but "dev.magento_2.nl" is in my desktop dev server
hosts file entry is "127.0.0.1 dev.magento_2.nl",
so, if may I ask what should I do to resolve this.
on further note the same works for magento 1.9 and earlier
[with different url ofcourse, say : dev.magento_1.nl]

[santrooper]

Ok, Sorry for being a "DUMB A#@".
"dev.magento_2.nl" > "dev.magento2.nl"

[vasilii-b]

How did you solved this ? I am getting in this trouble too.

[santrooper]

If you are using apache, in your local DEV env, try to use/configure virtual host entry, also do not forget to make changes to the hosts file, finally test your domain name like
"if (filter_var($_url, FILTER_VALIDATE_URL) === false) {".....
and finally using magento 2 cli do
[magento 2 root]$ sudo php bin/magento setup:upgrade

I hope this will help...

[sintsov]

Don't use your domain name symobol _, example site_dev.example.com
because expression filter_var($_url, FILTER_VALIDATE_URL) return false

[sankaran-consultant]

Its worked thanks @sintsov . you are great

[sintsov]

@sankaran-consultant no problem, friend!

[bratati1989]

@sintsov , I faced same problem. But your solution works. Thanks a lot.

[mrfroasty]

Thanks - was really puzzled by this @sidolov