I support EUEM and recently received a great question regarding what traffic our product monitors.
The goal of EUEM is to aid in monitoring your web traffic (performance &availability) and give you the end user experience using REAL end user data. This is metrics on live data from real people. The question came if we can accept traffic on ports other than 80 or 443. The short answer is yes. We can passively process traffic seen on all ports - as long as it is HTTP or HTTPS traffic. Of course, we'll need the ssl keys to decrypt the HTTPS traffic
EUEM also has the ability to be configured to only listen for traffic on ip's or ports or both.
Have any questions regarding this? - feel free to ask!