Error empty response when logging in magento admin - magento

I really stuck on this issue, everytime i log in into magento admin, it's give me an ERR_EMPTY_RESPONSE on google chrome and Connection reset on Mozilla.
The shop is still accessable, but it's load very slowly. It's working fine before, and suddenly become like this.
I can't find a similiar issue like this, mostly are the shop that return an empty response and they still can access the admin page and it's caused of enabling flat category/products set up.
I'm not sure if client enabling the flat category/products. If it so, what table should i edit using phpmyadmin?
since i can't access the admin page, or there are another thing that cause this? some error code, some files missing in admin directory or htaccess thing, actually i'm not doing changes on htaccess before. Really need your help.

Restarting apache and mysql worked for me
service httpd restart
service mysqld restart
Hope this helps.

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error 404 after login in frontend for SOME users

I'm facing a really strange issue with Magento.
Basically some users can login and interact with the site normally, and others login but end up with a 404 error on every page...
I've tried tweaking the cookies settings via Magento backend and also thru database. Exported and imported again the users, changed the session location from db to file... disabled cache, cleared cache, deleted everything from /var/ but nothing seem to help. And no errors are thrown anywhere.
I've also checked the session files for these users and they seem be fine.
I've noticed in the session files, that there's a brief history of the user... I was thinking if there are some tables where this data is coming from and that I can clear and see if it works.
I'm lost, really. And out of ideas!

blank page when loging in to backend part to magento

I recently updated all of my features in Magento from 1.8 to 1.8.1 and after that I’m having problems to log in to the admin dashboard. If i go to “www.example.com/admin” i get a 500 Internal Server Error error and was googling around i wasn’t able to find a solution.
Then i noticed i can go to “www.example.com/index.php/admin” and then all it returns is a blank page. And after hosting the log in page locally sending the right information to the original hosting service i get logged in, but the dashboard is totally blank.
I’ve tried all of the mighty google advises I’ve found, for example, clearing catch, changing permission to folders, looking in log-files for solutions, changing in the .htaccess, etc. But still haven’t found out what the problem is. Anyone had the same problem and maybe has a solution or advice?
Thanks in advance!

The whole UI gone from the website

I'm working on this website. Because the client changed some settings the 'index.php' was gone from website and I corrected. From then the whole UI of the website is gone. I tried to do something from the backend and the was wondered to see the backend also gone. It just redirects to the from end once I log-in for back. Are there any solutions for this. Please suggest. I'm in very much need of it.
Go to admin->system->configuration-> General->Web-> for both Unsecure and secure ->'Base URL' should not end with index.php
Flush the cache after changing the settings.
A fewdays back when I was working in my localmachine I faced the same problem. I'm not sure why the UI has gone, But the solution worked for me is:
In server cmd prompt, I have stopped the IP tables by command -- service iptables stop and by disabling selinux by command -- setenforce 0 ... After giving these two commands, clearing the cache , the site came normal. But these cannot be implemented on online servers. Just try with these. If it works then can come to conclusion, that server is fine.

Magento Backend Catalog page keeps refreshing

I have a magento install on a staging environment, everything is working except the catalog backend page and the frontend layered navigation. Look at the image below. There is a backend within the backend. When visiting the page it refreshes to infinity. See this identical problem
My first guess is there is a bug in the template file but an identical template file on my local machine does not cause any issues. Additionally the database between my local and staging site are identical minus the core_config_url. The only difference is local I am running Apache and on staging I am running nginx.
The second issue which I imagine is related is that the filters on the frontend catalog page dont work. They are visible but clicking on them reloads the page without changing the products.
Any help would be appreciated. Thanks
UPDATE: After switching from NGINX to Apache the issue disappeared. I still would like to figure out what is causing the problem
I take for granted that you had already tried different browsers/clearing your browser cache and Magento cache (empty the cache directory), etc.
Are you sure you put the correct value in the cookie_domain setting? Many users that had your same problem seem to have setted up an incorrect value in that setting.
Take a look here and let me know.
I have found that usually this is caused by a server-side error on the ajax request. If there is any kind of error response returned, it will just continue to spin. Either check your Chrome console for a 500 response, or look in your server's error logs.

Joomla cannot insert any more article in a category

This time i am having a weird problem about a Joomla 1.5 website.
When I try to add new article (number 3093) to a section/category that is in the menu and then I try to retrieve it, when i call the single article page i get an error. I can't say it's a 500 error because in my hosting logs and in joomla log i can't find any trace of the error.
Even when I curl the documents what i get is an empty response.
I checked the MYSQL databases and the article are here, i tried to recover a backup of the database and everything went ok, but when i try to add the article > 3093 i cannot retrieve them.
I tried changing themes, removing mod_rewrite, debugging php and mysql, but everything is working fine, i think that something is going wrong with the controller routing.
Anyone can help, any idea or similar experience can be appreciated

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