Service Temporarily Unavailable after logout or return from mangento extension manager

[shahabfk]

Hi,

I am getting error message Service Temporarily Unavailable after I logout or return admin link click from magento extention manager.

From admin side I login to magento extension manager to add new extension using zip file. 

When I want to go back to admin side or front end I am getting error.

I am using magento 1.8.

Any idea?

Thanks & Regards,

Shahab

[Mukesh Tiwari]

Go to magento root folder and delete 'maintenance.log' file.

[shahabfk]

Thanks it was maintenance.flag file in root folder.

-Thanks & Regards,

Shahab