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Webpages intermittently throw "This site can't be reached" errors

ccs123

Hello,

 

I have a strange one for one customer with a mixture of Windows 7,10 and OSX clients (approx 100)

 

Webpages will occasionaly not load and show the browsers standard "This site cannot be reached", however if refreshed, work like a charm.

 

I cannot see anything in the logs stopping this, I have tried with PS off etc, and the XG is not overloaded.

 

Any suggestions?



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  • FormerMember
    0 FormerMember

    Hi ccs123,

    Could you please check if you have more than one ISP link? If yes, please check if you have firewall rule with WAN link load balancing? 

    If you have above configuration, it could be the issue with one of the ISP link. Please check the status of the of the gateway by navigating to Configure > Network > WAN link manger. 

    Thanks,

     

  • 0

    Hi,

    what version of XG are you running and if v18 are you using DPI?

    Ian

    XG115W - v20.0.2 MR-2 - Home

    XG on VM 8 - v21 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0

    If I remeber right this  may happen, if one of your co nfigured DNS forwarders isn't working...

  • 0

    Hi  

    As others have said, please check DNS first on XG and client computers (possibly even DC).  Ensure there is no routing loop either and check for DNS loop, whereby XG is pointed to DCs and DCs are pointed to the XG.

    Also now that we have 2 different versions that behave very differently, please list the version number.

    Thanks!

    KingChris
    Community Support | Sophos Support
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  • 0

    Along with the other suggestions maybe double check your MTU side also.

     

    I have a issue with my ISP where the Sophos needs to be set to 1452 or I get similar issues and failed downloads etc.

    Just a thought :-)

    Sophos XG 450 (SFOS 18.5.1 MR-1)

    Sophos R.E.D 50 x 2

    Always configuring new stuff.....

  • 0 in reply to FormerMember

    I have one WAN link with 2 gateways, the gateways are configured as primary and secondary on the WAN access firewall rule. I cannot seem to configure the WAN in any other way (one WAN link with 2 gateways)

    I am using 17.5.10 - come to think of it, it coincides with the upgrade from 17.5.9..

    My clients connect to the DC, which then forwards to the XG, which then connects to google DNS, I cannot any problems with this?

     

     

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