I feel like I’m going a little bit crazy posting this, but hopefully someone might have an idea on how to point me in the right direction.
In the last 48hrs a small-ish sample of our users have started experiencing issues connecting to our API hosted at https://app.workshop.ws/
We haven’t changed anything recently to impact this, but our setup is Cloudflare as the DNS provider for our domain, with a CNAME record (app) pointing to an AWS load balancer.
I’m based in the UK and have a Virgin Media connection. Yesterday, from my laptop, I could access https://app.workshop.ws fine. My laptop is setup to use Cloudflare’s DNS resolver 22.214.171.124. From an iOS & Android device both connected to the same network, I was receiving DNS lookup errors and was unable to connect to https://app.workshop.ws/ on either device.
I’m not sure if this is an issue with Cloudflare or an issue with our application on AWS. I can’t see any error logs in our application which make me think it’s an issue with our application.
Similarly, a user today based in Dublin, Ireland was on an Eircom WiFi connection and couldn’t access https://app.workshop.ws or our connectivity checker tool https://app.workshop.ws/connectivity-check - as soon as they moved to 4G (a Vodafone connection) both websites resolved correctly.
Any ideas or pointers from anyone would be a massive help.