Thanks but I'm struggling here. Looks like I have AVG protecting me and Windows says the firewall is being looked after by AVG.
Still trying to work my way through the setups.
In that case, the installer will almost certainly not have set up any kind of exception in the AVG firewall.
You will need to create an exception in the AVG firewall for TCP port 8000.
From a quick Google, this might be where to start:
https://support.avg.com/SupportArticleView?l=en&urlName=AVG-Antivirus-Enhanced-Firewall-Packet-Rules&q=How+to+block+or+allow+IP+addresses+in+Firewall&supportType=homeScroll down to the section on Customise Packet Rules, and follow the instructions to Add a new packet rule.
The screenshot doesn't show everything ( there's a horizontal scroll bar ), but based on the description of the rules further up the page, I'd try:
Enter a name, eg 'Streamer'
Action: Allow
Protocol: TCP(6)
Direction: In
Address: Leave blank ( all addresses )
Local Port: 8000
Remote port: Leave blank ( accept from any source port )
ICMP type: Leave blank ( not applicable, this is not an ICMP rule )
Profile: All ( this rule will be applied to all firewall profiles )