Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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Extremely Slow Upload Speeds

Ever since I installed the Sophos firewall, I noticed that I only get about 7-30Mbps upload speed.  I have 1G/1G service and I have ruled many things out and have concluded it is definitely the Sophos firewall software (I have tried 18.0.5 MR-5-Build586 and 18.5.1 MR-1-Build326).   I really want to use this firewall as I like the features and interface over the others.

I get speed tests of ~850Mbps up and down when using any firewall other than Sophos.  This even includes a different software firewall (Untangled) on the same hardware so it's nothing in the hardware that's an issue.  I have attempted the following configurations and verifications:

- verified that no QoS is active

- Disabled all UTM including ATP, DoS protection, Zero-day, ssl/tls inspection, etc...

- Logs don't show anything being blocked

- Packet captures show nothing unusual when getting slow speeds

- even went through various other posts with the same issue and found none that apply

- interfaces have no errors

- MTU is fine

- Top from CLI shows no high RAM or CPU usage during uploads

 

I know the box is capable of handling it as a speed test from the Sophos CLI gets the full speeds.  It's only traffic going through the firewall that is affected.

Hardware specs:

CPU: J3455 @ 1.50GHz (4 cores)

RAM: 6GB

HD: 128GB



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