Service Temporarily Unavailable Magento?

My Application was working fine yesterday. I started my Pc today when I tried to start magento I Got This Error message.

Service Temporarily Unavailable

The server is temporarily unable to service your request due to maintenance downtime
or capacity problems. Please try again later.

I am not able to Open even admin page and I am not even able to see any sort of errors on then page. if i give any url of my magento site I am getting the above output. How do I resolve this? Please Help...

Answer

Check if there is a file called maintenance.flag in your magento root. If so Delete it.

When Magento is performing certain tasks it temporarily creates this file. Magento checks for its existence and if it's there will send users to the page you described.

It's supposed to automatically delete this file when done processing whatever task it was doing, but I've experienced occasions where something went wrong and it failed to delete it.

ref:

http://stackoverflow.com/questions/8102777/service-temporarily-unavailable-magento