6 Replies Latest reply on May 3, 2011 12:06 AM by simont

    Loss of internet connectivity on SG720

      I have a SG720 with firmware 4.0.8

      At seemingly random intervals, the connectivity on the WAN port stops. Internal connections on the LAN side work fine, but can't get in or out on the WAN side.

      The SG720 is the default gateway for the network

      Resetting the device via the GUI does not fix the issue - a Cold boot (power off and on) does resolve it instantly (well as soon as the SG720 starts up)

      I have looked in the logs, but can't see anything that appears before each lockup.

      we are using Remote syslog to capture the details.


      Sometimes there will be several days between lockups, sometimes a few hours.


      Any ideas?


      Message was edited by: Peter Morris on 17/02/11 6:44:46 PM


      Message was edited by: simont on 2/20/11 4:04:52 PM CST
        • 1. Loss of internet connectivity on SG720

          make sure you are using the latest firmware...I imagine you are using version4, so that would be 4.0.8


          can you telnet/ssh to the device when the issue occurs and ping the upstream gateway ?

          • 2. Loss of internet connectivity on SG720

            We certainly have 4.0.8. I haven't tried telnet or ssh, but I can access the GUI and look at of the options there.

            That is how we tried a reboot of the device (this did not fix the problem).

            Cannot ping outgoing from the 720 until a power cycle.

            We have also tried the other obvious things like changing the WAN ethernet cable to no avail.

            I will try telnet next time it happens if I am onsite. Often it happens when I am not here and the only remedy is the power cycle.

            • 3. Loss of internet connectivity on SG720

              I would suggest capturing some diagnostics from the unit while the problem is occurring and send them to technical support




              system -> help & support -> technical support report  -> download ( no full logs )


              with this info a diagnosis is possible,

              • 4. Loss of internet connectivity on SG720

                I have talked to one of the McAfee support techs and he suggested downgrading to 4.0.7 (after I sent him the diagnostics from the unit)

                We did this a week ago at about 7pm on the Wednesday.

                This morning (Thursday) the issue reoccured, however I was able to get things going by disabling the Internet interface and re-enabling it.

                Still means getting in a car to attend the site and our remote workers cannot connect.

                We will get the logs next time it happens.

                Do you have any other ideas in the mean time?




                • 5. Loss of internet connectivity on SG720

                  Can you generate a support report when the issue is occurring ?

                  If so, update the support ticket with the tsr and ask for the case to be escalated to level 3

                  • 6. Re: Loss of internet connectivity on SG720

                    I thought I should report back on this. We managed to get the warranty updated (the McAfee records had the resellers buy date, not our purchase date and the fault was report inbetween the two dates)


                    The problem turned out to be a faulty port on the device. When we connected the WAN connection to port B instead of port E, we had no more trouble.

                    McAfee have now replaced the device.

                    Thanks for your time and sorry it took so long to put this reply here.