@Thomas_Kwan / @Alex , An update from our side:We have renewed our client's SSL certificate today, which has resolved the error that was originally reported. Our previous SSL supplier was GoDaddy, and is now TSO Host. Both certificates are standard S...

Thanks for getting back so quickly @iandme, How did you manage to debug this? Were you using a tool like https://www.sslshopper.com/ssl-checker.html, and if so, did this flag the issue? Cheers.

Hi @iandme  Did you find a solution for this issue, as a few of us have had a very similar issue over at https://community.shopify.com/c/Shopify-APIs-SDKs/Application-Proxy-There-was-an-error-in-the-third-party/td-p/529794 from around the same time y...

Hi @Alex  Do you have any update on this following @Thomas_Kwan 's info? Thanks.

Thanks @Alex , We are currently hosting our app on Rackspace.

Hi @Alex  As confirmed previously, we can also access the endpoint directly, which functions correctly with a non-500 error, and have confirmed that this also works via ngrok, as does @Thomas_Kwan 's proxy. The response limit has been disregarded pre...

Hi Alex, To confirm from our side, we are also checking our access logs on our server, and are not getting anything coming through when using the proxy:https://unionsubscriptions.myshopify.com/apps/fulfilment => https://checkout.unionroasted.com/ As ...

Hi Thomas, We have been experiencing exactly the same issue at: https://unionsubscriptions.myshopify.com/apps/fulfilment which is supposed to be proxying a subdomain, but doesn't seem to be getting hit at our side. Getting the same 500 error you have...