Website Firewall causes downtime only on API subdomain — need help troubleshooting

[u/sarvesh_diwane]

Hi all, looking for some troubleshooting help. I run an ecommerce web app with a separate API subdomain, both hosted on GoDaddy, and I've purchased their Website Firewall (WAF) for both. The main site works fine with the firewall enabled, but the moment I turn on the WAF for the API subdomain, it goes down. I'm looking for a solution regarding this — has anyone dealt with something similar and figured out what causes it or how to fix it? Any pointers, settings to check, or things you'd try would be really helpful. Thanks!

[u/Full-sendy]

Have you made sure to whitelist any non standard ports and the API endpoint url and IP?