503 Proxy error - service, ECONNREFUSED. What does it mean?

Some of our users have experienced 503 errors lately. First on the 27th Oct at 14:00, then on the 2nd of November around 18:00. Is this related to our solution or a general issue?

This is a common error when not sufficient resources are available. Such as when calling a Service, but the autoscaling has reached its limit, and no resources are available.

A solution to the above: You might need to adjust your service to make it more performant (see Fair Usage Policies in how.appfarm.works). Also, you may contact Appfarm to enable autoscaling or increase the scaling limit.

In other cases, you might get this error in the Client, for the same reasons as above. In the DEV environment, it might occur also sometimes while (automatic) deploys are done, if the solution is very large.