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In WTFC to TCP flow control proxy the induced loss algorithm is used to slow down TCP sender located in the TCP domain. When congestion arises in the WTFC domain, packets begin accumulating in the proxy buffer. In our previous work, the original algorithm is optimized for the case of equal delay on both domains. In the more likely case that WTFC and TCP domains have different delays, the algorithm will either not react in time, or will lead to underutilization. In this paper, an adaptive version of the induced loss algorithm is proposed first. Then, in order to achieve low proxy buffer occupancy, receiver window advertizing is implemented based on round-trip time estimation, throughput measurement and proxy buffer occupancy. Simulation results verify the proposed concept.