Linux Kernel 3.10.0-957.5.1.el7 networking problem
I recently updated a CentOS machine with the mentioned kernel and networking things went wrong after upgrade. Some packets couldn't be delivered to application layer of OS and left without any reply.
Jointly with the help of support persons, we found the problem is the kernel version and I downgraded it to 862 and it works fine back.
I tested that kernel in other environments than Azure and all other environments I tested work fine. At lease 2 environments, one another public cloud and one on-premise virtualization.
I think some things are going wrong with Azure virtualization and I suggest to check things with that kernel version.