Today, aborted websocket connections to keep an open connection between ANCM and Kestrel due to a bug with websocket disconnect detection. If continued, internal ports would be exhausted, causing the server to effectively be DDOS’d.
This issue has been addressed in the following products:
.NET Core on Red Hat Enterprise Linux
Via RHSA-2019:0040 https://access.redhat.com/errata/RHSA-2019:0040