I just tested it by connecting to a server in the US via RDP and I can log into my firewall (I'm in Australia).
Are you sure you are using http
s and not http?
If you want to test that you have a path to your firewall from the internet, add the following rule:
Go to: Firewall ==> System Access ==> Add a new system access rule
Add the following rule:
Source address = nothing
Source interface = Red
Service: = Any
Protocol: = ICMP
Destination port (one per line): = 8
Destination port (one per line): = 30
Policy = ALLOW
Enabled = Tick
Save your rule.
You should now be able to ping your firewall from the Internet.
If it still doesn't work, turn the Outgoing Firewall off.
Go to:
Firewall ==> Outgoing traffic
and click on 'Enable Outgoing firewall' so it is grey, not blue.
Good luck