Warning Http Parser : Header is too large 8194>8192

Ignition
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Ignition 8.1.47
Sometime we have this warning on the gateway.
Any idea for the cause ?

(org.eclipse.jetty.http.HttpParser)

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Any chance you have a security scanner or some other kind of appliance inside your network trying to probe for vulnerable webservers?

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In this recent post about something similar I suggested some loggers you can turn on that might let you figure out the source of these: [8.1.44] Flood of org.eclipse.jetty.http.BadMessageException: 400: No Host - #7 by Kevin.Herron

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Yes we have a vpn tunnel with another site, it could be something like a security scanner. We will try to investiqate with the logger when it occur. Thanks !