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Anyone experiencing issues on XG's (SFOS 17.5.0 GA) with internet access and what looks to be possible DNS resolution failures.

Michael Coyle

Hi Everyone..   Looking for feedback if anyone else is seeing possible issues with new installs of XG's running 17.5

We've recently installed a number of  XG230 (SFOS 17.5.0 GA) at various clients and they are ALL having a similar issues with what looks to be DNS resolution. 

The XG's have had IPS /Heartbeat / ATP all turned off to test - rules enabled for LAN any to WAN any etc and all policies off (to test)..  So it should have nothing stopping / scanning traffic in or out - but the issue still happens.

It basically looks like a random drop but it's affecting most users at the same time - if they have outlook running on 365 open then that connection will also drop, FTP, etc basically anything that relies on an external connection will stop for a short period (10-20secs). 

The client sites have internal DNS servers that are fully functional and not logging any issues. 

You still appear to be able to ping an external IP when the drops happen.  There is no indication of issues with ISP or lines. 

Sophos have been looking at it for the last couple of weeks.. 

 



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  • 0 in reply to rfcat_vk

    Hi Ian,

    Standard set up.. 

    1. The XG's are set either with ISP or Google dns  - such as 8.8.8.8 / 8.8.4.4 / 1.1.1.1 

    2. The internal DNS servers are out via the XG - there are rules / polices etc in place to allow dns access from those servers..  there should be nothing on the xg filtering or blocking upstream resolution from forwarders / hints etc.

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