I had similar error since yesterday 28-01-2021 @19.52 GMT+7, my trading server cannot access the IndoDax API URL https://indodax.com/api/ and https://indodax.com/tapi/
According to IndoDax API Manual in Troubleshooting section here's what you need to do:
I'm getting 403 Unauthorized or 403 Forbidden error.
Our firewall often too aggressive and it creates false positive for
genuine requests. Please send your IP addresses to our customer service so we can manually unblock your IPs
I've send the request email to add the IP exclusion for my IP address so my server can access IndoDax API server a few minutes ago. But until now there is no reply from IndoDax, maybe it's weekend, and I will wait until monday or so before I try to call their office.
Their support email address is support [at] indodax [dot] com as listed on their main website page.
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