Backend redirects to 404

[Taral-Patoliya]

When I changes the port to 8080 from 80, and tried to access the backend, it redirected me to 404,
This is due to the isHostBackend() method in Magento\Backend\App\Area\FrontNameResolver
returns false,
The $backendHost and $_SERVER['HTTP_HOST']) are not the same.

[kassner]

I guess this is somehow related to Auto-redirect to Base URL as in #2272

[arkadiych]

Internally tracking - MAGETWO-45105

[danslo]

Can confirm this issue, and fixed it with following diff:

diff --git app/code/Magento/Backend/App/Area/FrontNameResolver.php app/code/Magento/Backend/App/Area/FrontNameResolver.php
index ab4e9eb..a375fb4 100644
--- app/code/Magento/Backend/App/Area/FrontNameResolver.php
+++ app/code/Magento/Backend/App/Area/FrontNameResolver.php
@@ -85,7 +85,7 @@ class FrontNameResolver implements \Magento\Framework\App\Area\FrontNameResolver
     {
         $backendUrl = $this->configInterface->getValue(Store::XML_PATH_UNSECURE_BASE_URL, ScopeInterface::SCOPE_STORE);
         $backendHost = parse_url(trim($backendUrl), PHP_URL_HOST);
-        $host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
+        $host = isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '';
         return (strcasecmp($backendHost, $host) === 0);
     }
 }

[davidalger]

Closing as duplicate of #2272

[mazhalai]

@Taral-Patoliya Please try again, this has been fixed in RC2.

[100rabhMisra]

after installation magento2, it redirected me to 404, not open admin panel ?
how to fix it can you any one tell me ??

[benmarks]

@100rabhMisra please do not comment on closed issues. Moreover, support questions should be asked on the Magento forums or at Magento SE.