Magento 500 internal server error

[Resolved]: Magento 500 internal server error
If you are getting “500 Internal Server Error” then the reason might be permissions issue or fatal error.

In Magento, you can check the errors occured in files:
var/log/system.log
var/log/exception.log

You can even allow the error to output to your browser by editing your Magento index.php with:
error_reporting(E_ALL | E_STRICT);
ini_set(‘display_errors’, 1);

Also, try this to solve the error:
- Check the owner of your magento project. It should be the server (www-data for apache)
chown -R www-data:www-data .

- Change the directory permissions to 755 and file permissions to 644 for your project
find . -type d -exec chmod 0755 {} \;
find . -type f -exec chmod 0644 {} \;
chmod 550 pear
chmod 550 mage
chmod 755 -R var

- Check after upgrade do you have your .htaccess file inside Magento root

Magento: Can’t login/add items in Chrome and IE

Problem: In Chrome and IE, user as well as admin are unable to login as well as add items to cart. In Firefox, everything works fine.

Solution: This is due to the cookie problem, not in browser but in Magento itself. In Magento, by default cookie’s lifetime is set to 3600 (1 hour). But if the end users computer time runs ahead of server’s time, cookies will not get set for magento frontend as well as backend. For example, end user’s computer time is 1 hour forward than server’s time, that means the cookie (holding user’s session id) will expire as soon as user logs in or tries to add an item.

To solve this, set cookie’s lifetime to 86400 (1 day) instead of 1 hour and everything will work as expected. You can also set cookie lifetime to 0, so that cookie will only expire when the user’s browser is closed.

Go to: Magento backend -> Sytem -> Configuration -> Web -> Session and Cookie Management
Set cookie lifetime to 86400 and save. Everything will work as expected now.

Magento 1.5: Cannot login to admin panel after fresh install

After installing magento 1.5, I tried to login to the admin panel with correct username and password, but it does not let me in without any error message. This is due to cookie problem in magento and can be fixed as below:

Open this file in your favorite editor: app/code/core/Mage/Core/Model/Session/Abstract/Varien.php

Comment lines that says like (probably line number 81 to 83)

1
2
3

$this->getCookie()->getDomain(),
$this->getCookie()->isSecure(),
$this->getCookie()->getHttponly()

to

1
2
3

//$this->getCookie()->getDomain(),
//$this->getCookie()->isSecure(),
//$this->getCookie()->getHttponly()

Now you could login to your admin panel without any problem.