Not necessarily. Check the firewalls on your router and computer. Just because a third party website says they are open does not necessarily mean that the node is actually accessible.
No firewall on my Mac.
I have not touched the firewall settings on my router or any other settings for that matter, and just doublechecked them – same as ever. I just power-cycled my router and restarted Core. Still stuck at 8 connections.
SPI firewall shows the following options are
checked:
Block Anonymous WAN Requests (ping)
Filter Multicast
Filter IDENT (Port 113)
Block WAN SNMP access
Anything fishy-looking?