I am getting this error on my wordpress site ;(

Service Temporarily Unavailable

The server closed the connection without sending any data.
The server is temporarily unable to service your request due tomaintenance downtime or capacity problems.
Due to heavy load on the server, connections may be temporarilyblocked from locations that fetch an unusually high number ofpages.
We apologize for the inconvenience.
this error sometime displayed when i upload any pic to my wordpress site or sometimes when i do login.
What can be the reasons for this.
Only i am suffering from this or all my website visitor will suffer from this.

you can get better response on wp site btw i think it's your host problem so try talking to your host

Just check your web hosting provider on which your website is hosted.

I have faced same problem.here I get the answer.Thanks.