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Sophos UTM 9 - Throttling Bandwidth Down to 10 mps

Dylan Casey

Hello - I'm a novice at this, but I'm having an issue with one of our Sophos UTM 9 devices and my re-seller is unwilling to assist.  We have 5 locations running these devices and 4 out of 5 of them are working as expected.  However, one location is having it's bandwidth throttled behind the UTM.  Our ISP is TWC/Spectrum and we have a 400 up / 50 down package.  When plugging any device (I've used 2 laptops to test this) directly into the TWC modem, our speeds are close to what we should be getting ~391 / ~42.  However, anything behind the UTM is only getting speeds in the 8.2 - 9.8 range for up & down.  I've seen on other threads that IPS may cause this, but this has been disabled and the problem persists.  Further, I believe I configured this device the exact same way as I did for my other locations, but only one location is having an issue.  Has anyone else run into this before?  Any suggestions?  Thank you in advance!



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  • +1

    Two things to check:

    1. Speed-duplex mismatch.   
      If one device is set to a fixed speed-duplex, and the other end is set to Auto, the Auto will negotiate to the correct speed but use half-duplex.   This creates performance problems due to collisions and errors.  Both ends must be Auto or both ends must be Fixed.
    2. MTU mismatch.
      Some users have problems with their ISP sending a low MTU (usually 576) in their DHCP parameters, which UTM honors.  The fix is to force UTM to ignore the DHCP parameter.   Details are somewhere in this forum, but I do not have a links so you will have to search.
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  • +1

    Two things to check:

    1. Speed-duplex mismatch.   
      If one device is set to a fixed speed-duplex, and the other end is set to Auto, the Auto will negotiate to the correct speed but use half-duplex.   This creates performance problems due to collisions and errors.  Both ends must be Auto or both ends must be Fixed.
    2. MTU mismatch.
      Some users have problems with their ISP sending a low MTU (usually 576) in their DHCP parameters, which UTM honors.  The fix is to force UTM to ignore the DHCP parameter.   Details are somewhere in this forum, but I do not have a links so you will have to search.
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