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Client devices using SNTP not working with NTP server options

Chris Priestley

I have a sophos running UTM firmware 9.403-4. This is running as an NTP server for client devices. It's working for all devices except some spectralink 8440 wifi phones which use SNTP (not NTP) for time sync.

 

Is this supported on the Sophos end?

 

Are there any logs available to check for NTP requests being sent tot the sophos?



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  • 0

    Hi, Chris, and welcome to the UTM Community!

    What do you learn from doing #1 in Rulz?

    Cheers - Bob

  • 0 in reply to BAlfson

    Hi Bob

     

    I couldn't locate any specific information in the logs, I searched before posting, hence why I asked if there was a specific log capturing the NTP request information.

    I've been monitoring the live firewall, intrusion prevention and application control and I can't see anything related to NTP traffic.

  • 0 in reply to Chris Priestley

    You probably don't have an explicit firewall rule that silently drops NTP packets, so we can conclude that they aren't being dropped by the UTM.  On the 'Bandwidth Usage' tab of 'Logging & Reporting >> Network Usage', you can look at "Top clients by service" for NTP.  That will tell you if the UTM is receiving time requests from the phones.

    Cheers - Bob

  • 0 in reply to BAlfson

    I have devices that use SNTP, and have no problems.

    The only time I had an issue (which is a real face-palm moment) ...

    you did add the network they are on into the allowed networks list?

     

    Jason

  • 0 in reply to Argo

    Hi Jason

    I have made sure they vlan is the allowed network list for NTP.

    It was working until we went into Daylight saving time here in Australia. The client phones did not update (Other systems on the same network did). We have the phone vendor swearing black and blue that it's a network issue.

    I'm just looking for conformation 1 way or the other.

  • 0 in reply to Chris Priestley

    To answer your original question, Chris, I can't imagine that a system capable of full NTP would not be able to do Simple NTP.

    If this changed when you went on DST, then I bet the phones won't accept the new time because the time is so far off that they're reaching the wrong time server.  What do the phone people say about that?

    Cheers - Bob

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  • 0 in reply to Chris Priestley

    To answer your original question, Chris, I can't imagine that a system capable of full NTP would not be able to do Simple NTP.

    If this changed when you went on DST, then I bet the phones won't accept the new time because the time is so far off that they're reaching the wrong time server.  What do the phone people say about that?

    Cheers - Bob

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