I'm might embarrass myself with this question, because of something really obvious, but I'm puzzled.
My home broadband firewall log says it has been blocking incoming TCP traffic with a source (!) port of 443. What in the world might that be? If somebody was attempting an HTTPS connection, that would be destination port 443, not source port, right?
Here's the entry from the log file:
[UFW BLOCK] IN=enp3s0 OUT= MAC=xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx SRC=xx.xx.xx.x DST=xx.xx.xx.xx LEN=89 TOS=0x00 PREC=0x20 TTL=59 ID=58112 DF PROTO=TCP SPT=443 DPT=56419 WINDOW=7776 RES=0x00 ACK PSH URGP=0
What might this be trying to do?