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WAN High Bandwidth Usage

Hi all,

I've a big problem on Sophos UTM 9.314-13. From few days I'm experiencing very high bandwidth usage from WAN interface (not internal hosts, directly from WAN interface) with HTTP protocol (many gigas at day), almost 100% bandwidth usage, inbound (99.55%).

What's the problem? I've checked internal network (60 users) and none of them is using massively internet during the day.

Plus, in System Log i've found strange messages about DNS resolver, like:

dns-resolver[5103]: DNS server failed to contact!

However I've configured DNS forwarders and internal domain correctly (as Sophos best practice).

What can I do? I have to downgrade it? To which version to avoid this issue?

Apparently the WAN interface "downloads" HTTP data but I can't see from which host it is downloading this data?

Can anyone help me?

Thanks

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0 Unknownable over 9 years ago

Update: with tcpdump i've seen that this traffic is due to continue connections to llnw.net.http hosts (i think cloud services).
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0 Unknownable over 9 years ago in reply to Unknownable

No one have any suggestion?

However, I'm still investigating and I've found a correlation with Web HTTP proxy feature: if I restart the http_proxy the issue go away for 1-2 minutes.

So i think this issue is related to HTTP proxy feature of Sophos UTM.

Anyone have my same problem or issue?
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0 irfanmulla over 8 years ago in reply to Unknownable

Have your issue got resolved ????
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0 irfanmulla over 8 years ago in reply to Unknownable

Have your issue got resolved ????
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