Infopath error:The server is currently being taken down for maintenance::MOSS2007, SP2010

That was certainly not an expected incident, easy to resolve if you would point out where the issue was.

Infopath forms failed in an specific site, the rest of the site collections seemed to work fine.The message that the user got was:

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.

And the image (I will show both versions, MOSS 2007 and SP2010 version of the message):

It was after testing some backup application related to SharePoint.

The version was SharePoint 2010.

After reviewing the database status (read only = NO) and that the Site collection was not lock through the Central administration we checked the status of the farm, because the message was quiet explicit about the maintenance part, and the only idea taht pop-up in my head was that old-fashioned command related to Quiesce.

Open a Sharepoint Power shell using an account with priviledges over the SharePoint (sharepoint administrator) and run the following command:

stsadm.exe -o quiescefarmstatus

If the result is "Farm is Quiesced" then run the following command in order to change this status of the farm, which normally is used for maintenance purposes.

stsadm.exe -o unquiescefarm

stsadm.exe -o quiescefarmstatus
you should get now "Farm is not Quiescing"