Hi, dtls is enabled on both sides. I don't think this is the problem, because the throughput from the vpn client to the server is also good, but from the server to the client is not even half.
on the same fiber connection we have another 60F for testing, when I establish a ssl vpn connection over this fortigate the throughput is correct (about 3-4 Mbyte per sec). The ssl vpn configuration is exactly the same. Over the 200F active/passive cluster I reach approx. 300-800 k per sec.
Hi Jamal, I have already tried everything from your link except iperf. Also it doesn't explain why I achieve the desired performance on our 60F with the same settings, the same servers, the same clients, the same internet connections. The 60F is also connected to the same switch as the 200F cluster. both firewalls are connected to the ISP router via the same switch.
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