Intermittent readblocking failures to remote gateways

We are having intermittent readblocking failures over a remote tag provider. The tags will always read fine on local gateway but will intermittently fail on the front-end gateway which accesses across gateway network. The Gateway network status has never shown anything but running. Any suggestions on troubleshooting this issue?

8.1.13

Yes, check logs.

Are you using SSL for the GN?

yes, I am using SSL. I have checked the logs and yes it fails, just cannot decipher why this is happening. Everything seems fine server to server. No dropped packets at all.

I will be great to see what the logs says