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I am experiencing very slow SSL VPN speeds (10x slower than internet upload speed, 70x slower than internet download speed). I read almost all posts I could find, but no solution worked.
Can you help me out?
Here is what I have as a setup:
Hardware: Qotom q355g4, 6GB RAM, 120GB SSD, (Sophos XG runs directly on the hardware)
Transfer speeds on the VPN (both download and upload):
SSL VPN UDP Settings:
VPN to LAN rule:
A couple of things to try might be to disable compression and/or switch Application Control to "none" and see if that makes any difference.
When you use UDP it may be wise to decrease the MTU on your client to 1312. This depends on your ISP.
In reply to Bill Roland:
Hi Bill, I can confirm these modifications don't work.
In reply to Weatherlights:
When I am running a ping both on LAN and on remote via SSL VPN towards server on LAN, I get the following:
C:\Users\user_name>ping google.ca -f -l 1382Pinging google.ca [184.108.40.206] with 1382 bytes of data:Reply from 220.127.116.11: bytes=64 (sent 1382) time=9ms TTL=54Reply from 18.104.22.168: bytes=64 (sent 1382) time=9ms TTL=54Reply from 22.214.171.124: bytes=64 (sent 1382) time=10ms TTL=54Reply from 126.96.36.199: bytes=64 (sent 1382) time=13ms TTL=54Ping statistics for 188.8.131.52: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 9ms, Maximum = 13ms, Average = 10ms
I am on cable and not PPOE (DSL)
Without modifying anything on the server, I added the following on the client .conf file:
I then tried:
tun-mtu 1382mssfix 1342
No change either for: tun-mtu 1312 as you suggested.
Maybe I am doing things wrong.
Any document detailing how to modify the MTU on SFOS XG for SSL VPN in UDP mode?