An Administrator must approve this form template before it can be filled out by using a browser.

Currently i was working with InfoPath forms for me to design some form templates and later which will be published in SharePoint to enable nintex workflow. Most of time we were used to develop InfoPath forms which is compatible with browser. In other words browser compatible InfoPath forms.

I came across a situation where we need to get the current IP address of the logged in user to the InfoPath form. So at that time i had to write some C# codes in InfoPath form. Upon finished with the codes when i tried to publish the form, mid of the publishing wizard it didn't allow me to publish the InfoPath template directly to the SharePoint library, instead it forced me save it in locally informing “Administrator must approve this form template before it can be filled out by using a browser”.

the reason was :

This behavior occurs because a Microsoft Visual Studio 2005 Tools for the Microsoft Office System form contains managed code by default.

Note: If a form template contains managed code, the Publishing Wizard lets you click only the Administrator-approved form template (advanced) option.

the only way in this situation is to save the InfoPath template locally and to upload the same template via the Central Administration.