We're experiencing with the following issue since last couple weeks. I've tried to figure out the root cause of problem and post it in MSDN Forums as follows:-http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2796881&SiteID=1&mode=1 - Finally, I digging into server farm and found that Server Farm has been Quiesced by someone – Here's the small summary of it;
Problem
Error
"The server is currently being taken down for maintenance. Check with your system administrator to see when this server is scheduled to come back online. Click Try Again to attempt to load the form again. If this error persists, contact the support team for the Web site. Click Close to exit this message." (Image shown in the attached document)
Cause of the problem:
The server farm has been Quiesced (Image shown in the attached document)
Solution:
Go to Central Administrator->Operations->Global Configuration-> Quiesce Farm and Click `Reset farm' (Image shown in the attached document)
lovedjohnysmith