<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"><br></div><div dir="ltr"><br>On Apr 11, 2019, at 10:08, Patrick McEvilly <<a href="mailto:patrick_mcevilly@harvard.edu">patrick_mcevilly@harvard.edu</a>> wrote:<br><br>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? <br></div><div dir="ltr"><header class="entry-header" style="box-sizing: inherit;"><h1 class="entry-title" style="box-sizing: inherit; border: 0px; font-style: inherit; margin: 0px 0px 0.55em; outline: 0px; padding: 0px; vertical-align: baseline; clear: both; font-weight: 400; line-height: 1em; word-wrap: normal;"><font size="3"><span style="background-color: rgba(255, 255, 255, 0);">Filtering Exploitable Ports and Minimizing Risk from the Internet and from Your Customers - </span></font><span style="font-size: medium; font-style: italic; background-color: rgba(255, 255, 255, 0);">What are you doing to prepare for the next “scanning malware” and “Internet Worm?”</span></h1></header></div><div dir="ltr"><a href="http://www.senki.org/operators-security-toolkit/filtering-exploitable-ports-and-minimizing-risk-to-and-from-your-customers/">http://www.senki.org/operators-security-toolkit/filtering-exploitable-ports-and-minimizing-risk-to-and-from-your-customers/</a></div></body></html>