Monti APM Connection Error Caused by Proxy Server

[sitiarel]

We have 11 servers and we are using MontiAPM on all of them. When we started routing the traffic from these 11 servers through the same proxy server, we began to receive the following error:

Monti APM: Unable to connect. Maximum retry limit reached for Request failed: 503
Monti: Error sending CPU profile [MaxRetryError: Maximum retry limit reached for Request failed: 503]

But when we turned off the proxy, there were no issues.

[leonardoventurini]

Hi @sitiarel, here is a few things to try:

1. Does it work when you try to make a post request to other endpoints? If not it is a configuration issue on the proxy side blocking all outbound requests.
2. Do outbound websocket connections work? I think the agent tries to establish a connection on initialization to send stuff over DDP, some proxy servers also have to be configured to allow websocket connections to work properly, inbound and outbound, I assume that inbound is working fine but not outbound.

Can you give us details on which proxy server are you using and how it is configured? Thanks!

Anything let me know.