|Sorry CurtR but that isn't what the OP wants and would not utilize the two public ips.|
Post the results of an ipconfig /all from the server not connecting for review.
Once again there should be a "test the wan connect" interface in the router. Usually it connects you to the manufacturers web page or gives a message like test Ok or failed. Please find this interface in the router and test from the router to the internet. Some also have ping as a test so ping yahoo.com for example.
Another approach is to take that static ip and assign it to a workstation. Put the workstation on the switch [disconnect the problem router] and see if the workstation connects.
If it doesn't call you isp. It is something at their end not yours that is the problem.
If it does connect then the problem is located specifically tg the router. We will address that once you have done the tests above.