TCP connections resiliency system for testing networks in unstable environments

The subject matter described herein relates to methods, systems, and computer readable media for test system connection resiliency. In some examples, a method for testing a network device under test (DUT) includes exchanging a sequence of data packages over a transmission control protocol (TCP) connection between a client and a server and through the network DUT. The method includes storing client sequence identifiers and server sequence identifiers. The method includes synchronizing, in response to detecting an error on the TCP connection, the client and the server to a last data package exchanged prior to the error using the client sequence identifiers and the server sequence identifiers and resuming a test script at a next data package after the last data package exchanged prior to the error in the sequence of data packages.