On Apr 11, 2019, at 10:08, Patrick McEvilly <patrick_mcevilly@harvard.edu> wrote:

They are refusing to remove the tcp port 1900 filter without dispensation from the DDoS security gods. I understand blocking UDP 1900, what is the purpose of Level3 filtering tcp port 1900?

Filtering Exploitable Ports and Minimizing Risk from the Internet and from Your Customers - What are you doing to prepare for the next “scanning malware” and “Internet Worm?”

http://www.senki.org/operators-security-toolkit/filtering-exploitable-ports-and-minimizing-risk-to-and-from-your-customers/