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 configuration changes:
- 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
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.
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