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SSL VPN slow

I'm getting a max of around 15Mbps using both SSL Site-to-site VPNs and the client based VPN.

I have an Sophos UTM 320 and would expect much higher throughput. Our connection is in a datacentre with a gigabit internet connection.

HTTP and FTP traffic scales up to 100's of MBps on the same connection, but the max I can get is 15 on the SSL VPN.

I've seen in here that UDP can make a difference, but I cannot change this unfortunately.

Details:

TCP 443
AES-256-CBC
Compression off (although turning on doesn't improve things)

CPU/memory usage is low.


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