I have read: How do I disable VsHub.exe in the system tray? and https://connect.microsoft.com/VisualStudio/feedback/details/1919828/hundreds-of-calls-second-to-vshub-and-bro
The above didn't work for me, as such. It seemed to shut down ALL fiddler monitoring of the localhost host.
A bit of judicious googling gave me another solution - to block the port specifically by adding this to the bottom of the OnBeforeRequest section:
if (oSession.host=="localhost:49155"){
oSession["ui-hide"] = "true";
}
This seems to block the port from being reported in Fiddler, without disrupting further localhost traffic.