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Re: Determining whether a TCP connection is up


From: Paul Eggert
Subject: Re: Determining whether a TCP connection is up
Date: Sat, 03 Aug 2013 07:09:47 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130623 Thunderbird/17.0.7

On 08/03/2013 05:30 AM, Lars Magne Ingebrigtsen wrote:
> Is there a general TCP way
> to probe for a connection?  Can we (for instance) send a TCP KEEPALIVE
> once and see whether we get anything back within (say) a second?

I'm afraid not, since TCP keepalives won't work through proxies.
See, for example, the first FAQ in
http://www.proftpd.org/docs/howto/KeepAlives.html



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