If mining is on, on an Ethereum node on EC2 AWS instance, it is unable to connnect to peers on Azure

Question

I am runing a private ethereum network with nodes on AWS and Azure.

AWS EC2 - Mining Node & Azure - Peering node

When the mining is on, in AWS node, the peering is lost intermitently, with Azure node. But when the mining is stopped, the peering happens and all blocks are in sync.

Have someone faced similar issue or what might have caused the issue? Any resolution or lead is of great help.

Regards, Manoj