I installed JoomSEF4.2.5, and close the Joomla built-in the SEF started JoomSEF, the Joomla backend cannot login, how do? Urgent!!!
Joomla Uyghurs Portal

Hi,
What exactly happens when you try to log in to your Joomla backend? Do you see any error message?

I installed JoomSEF 4.2.5 and start it, turn off the joomla built-in the SEF, but now the backend get in, there has been a 404 error, cannot find Oops components.
By joomlauy.org/administrator login automatically to skip joomlauy.org/index.php and displays a 404 error page.
There is no way to go in the backend?
Or through the database whether to revert back?
My system is: WINSERVER2008 + IIS7.5 + PHP5.3.8 + MySQL5.5.18
Joomla Uyghurs Portal

This seems like some problem with URL rewriting. Check the rewrite rules in your IIS server configuration. Other than that I don't know what could cause this.

There is no other way to log in backend?
For example, the database to disable the JoomSEF.

You can disable JoomSEF by creating a file /administrator/components/com_sef/configuration.php with the following content:

Or by disabling its plugin in database (using phpMyAdmin for example) - in table _extensions find the record with type=plugin, element=joomsef and folder=system and set enabled=0 for it.