In very rare cases the default website timeout of 110 seconds may need be increased. To do this, the executionTimeout
(in seconds) attribute of the httpRuntime
element of the Produce/Manage web.config file can be modified.
The httpRuntime element after modification might look something like:
<httpRuntime requestValidationMode="2.0" executionTimeout="300" />
This is a great article with an expanded explanation of the httpRuntime http://msdn.microsoft.com/en-us/library/e1f13641.aspx.
increase produce manage timeouts executionTimeout httpRuntime