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Troubleshooting dropped TCP connections

We're trying to figure out why connections to this server are dropping. Looking at the capture it seems like both sides go silent at one point then 2 hours later the client tries to keep the connection alive and the server resets it. Looking at the capture, it would seem that either the server should realize it didn't get an acknowledgement for missing segments and resend them, and the client should continue sending duplicate acks until the server resends it. The capture I have was done on the client so maybe the server is retrying but they're MIA. Though there's other traffic on the connection that indicates data is still passed. When traffic from the server stops, is it possible it hit the limit of the congestion window? Any insight to the problem is appreciated.