I'm running into an issue with two hosts on different networks. They can ping each other, and even access data on each other, however when they attempt to access specific yet random portions of data on each other, the connection fails.
Both hosts are on different networks, there are firewalls between the two but both have been set up to hit a temp policy where there isn't any AV scanning/IPS scanning and all services are allowed. I know it's not a routing issue but more of a TCP issue. I ran packet captures on both hosts and I found that either host can send a SYN to the other one and receive it, and they can also send SYN-ACKs and both receive as well. However when either host sends an ACK, neither ever received the packet. Has anyone ever seen this issue before? I'm stumped as to what would cause devices to specifically not receive ACKs.
A little more information, the traffic rides a private MPLS between two data centers, both protected by a firewall.
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