Can't Connect to Xbox Live at College?

Some Details: I have an Xbox 360 S Console with the built in wifi active. Upon testing for a connection, the test can verify the router point "Resnet", it can verify the router has internet, but upon the diagnostics from the internet to Xbox Live an Error reads that my MTU settings are not sufficient. I do not have the authority to change router settings and at last resorts would i want to call the IT department at my university. I also cannot connect my xbox to an ethernet port. The signal from my xbox to the router is at full bars. If anyone has any suggestions or solutions i would love you greatly! Thank You for your time! PS: If anyone needs additional details i can provide anything.