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host not found errors

alehman
Recently one of my appliance boxes has started producing numerous "host not found" errors to web clients. This started a few weeks ago about the time it upgraded to 9.006-5. I have several appliances on the same software revision that do not have this problem.

I have tried changing DNS forwarders and tried deleting all of the forwarders. I tried a Google forwarder as well. I tried disabling virus scanning also. There is nothing in the IPS logs. The DNS log shows the errors.

I opened a support case last week, but I was hoping for some troubleshooting hints while I wait for Sophos to respond.

Thanks,
Alan


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  • 0
    There are only a few DNS timeout errors in http.log, but I see lots of "host not found" errors:

    2013:10:14-08:44:52 astaro-1 httpproxy[5277]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="GET" srcip="172.16.11.100" dstip="" user="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="2576" request="0xd189788" url="vortex.accuweather.com/.../120x90_10140801_page.jpg" exceptions="" error="Host not found" category="108" reputation="neutral" categoryname="Public Information"

    There are hundreds of DNS timeout errors in named.log:

    2013:10:14-08:44:53 astaro-1 named[4158]: error (host unreachable) resolving 'enterprisesolutions.accuweather.com/A/IN': 207.242.93.20#53
    2013:10:14-08:44:53 astaro-1 named[4158]: client 172.16.11.3#60724 (enterprisesolutions.accuweather.com): error sending response: host unreachable

    I also opened a support case and included a link to this thread.
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  • 0
    There are only a few DNS timeout errors in http.log, but I see lots of "host not found" errors:

    2013:10:14-08:44:52 astaro-1 httpproxy[5277]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="GET" srcip="172.16.11.100" dstip="" user="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="2576" request="0xd189788" url="vortex.accuweather.com/.../120x90_10140801_page.jpg" exceptions="" error="Host not found" category="108" reputation="neutral" categoryname="Public Information"

    There are hundreds of DNS timeout errors in named.log:

    2013:10:14-08:44:53 astaro-1 named[4158]: error (host unreachable) resolving 'enterprisesolutions.accuweather.com/A/IN': 207.242.93.20#53
    2013:10:14-08:44:53 astaro-1 named[4158]: client 172.16.11.3#60724 (enterprisesolutions.accuweather.com): error sending response: host unreachable

    I also opened a support case and included a link to this thread.
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