Traditional Transmission Control Protocol (TCP) works well in wired network but suffers from performance degradation in mobile ad-hoc networks (MANET) due to the fact that it cannot distinguish packet losses due to congestion from packet losses due to link breakage, channel error and route changes. In this paper, an enhanced TCP, named TCP Freeze-Probing, is proposed to improve the TCP performance in mobile ad-hoc networks. TCP Freeze-Probing is an end-to-end approach that does not need the cooperation of the intermediate nodes in the network. Besides, a throughput model for TCP Freeze-Probing is given, which is validated through simulation. It is shown by analysis and simulation that the proposed approach can greatly improve the TCP performance in MANET.