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brief-actuator's avatar
brief-actuator
Tutor
Dec 11, 2025
Solved

CAX80 v5.1.1.8 Firewall Blocking HTTPS API Traffic - DMZ Confirmed

Hi all,   I'm experiencing a firewall bug on my CAX80 (firmware v5.1.1.8) that's blocking HTTPS API calls to legitimate services (specifically api.anthropic.com for Claude AI/Claude Code).   Symp...
cax80
  • FURRYe38's avatar
    FURRYe38
    Dec 11, 2025

    What region are you located? 

    Who is your ISP?

     

    Is SIP ALG enabled on the modem? 

     

     

    Something to contact NG about.

    Something to contact NG support about.

    Look up what ports are used by your API traffic and input that in to Port Forwarding or Port Triggering configuration. If you try this, be sure to disable uPnP before hand. 

brief-actuator's avatar
brief-actuator
Tutor
Dec 12, 2025

StephenB​  Thanks for the suggestion! I can try forwarding 443 and 54545 to my Mac.

 

Quick question: Should I use Port Forwarding or Port Triggering for this? And do I need both inbound/outbound rules or just inbound?

StephenB's avatar
StephenB
Guru - Experienced User
Dec 12, 2025
brief-actuator wrote:

Quick question: Should I use Port Forwarding or Port Triggering for this?

I suggest port forwarding

 

brief-actuator wrote:

And do I need both inbound/outbound rules or just inbound?

Just inbound.  Outbound connections aren't filtered.

  • brief-actuator's avatar
    brief-actuator
    Tutor
    Dec 13, 2025

    StephenB​ port forwarding with UPnP disabled seems to be working so far! Thanks so much for your quick help :)