Interface Testing is performed to evaluate whether systems or components pass data and control correctly to one another. It is to verify if all the interactions between these modules are working properly and errors are handled properly.
Verify that communication between the systems are done correctly
Verify if all supported hardware/software has been tested
Verify if all linked documents be supported/opened on all platforms
Verify the security requirements or encryption while communication happens between systems
Check if a Solution can handle network failures between Web site and application server