Not sure why BitCore could be using HTTP server... But anyway, disabling "listen" is more of a workaround than a solution, as there is something wrong with that PC, which could manifest in different way, so it should be fixed instead.
Did you try to check who is using the port 8555? TCPView (
https://docs.microsoft.com/en-us/sysinternals/downloads/tcpview) should show it. You may have some kind of malware, which is using multiple ports on your PC. Or just the opposite - a new antivirus, which is blocking all the ports.
I don't have any antivirus program(disabled Microsoft Defender permanantly as well), and I downloaded 2 to check if I had a virus and they say I don't (Deleted them afterwards

)
I asked around more, and one told me that 0.0.0.0 is the local machine gateway, so my problem is probably there... But I have no idea what could be wrong.
I edited my bootloader with bcdedit a few days back, so that may be it, but it worked a few times after I edited, so I don't think that is it