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3-way handshake not completed [message #118874]

Mon, 26 January 2015 21:18

Gaby
Messages: 34
Registered: March 2010

I have Kerio Control firewall with two WAN connections with load balancing. One of it points to an internal mail server (Kerio Connect).

There's a weird behavior here. If you want to access webmail from certain external addresses there is no response (cannot connect). If from the same problematic address you access through the other WAN connection there is no problem.

But, oddly from other addresses there is no problem.

Looking in the debug report I found this error from one problematic address:

[21/Jan/2015 21:53:17] {pktdrop} packet dropped: 3-way handshake not completed (from Internet Telmex, proto:TCP, len:41, 190.97.45.65:65388 -> 200.80.203.43:80, flags:[ ACK ], seq:2586090912 ack:20916154, win:252, tcplen:1)

I believe this is the reason but I'm not completely sure.

Any help will be appreciated.

Thanks in advance.

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[Message index]

		3-way handshake not completed By: Gaby on Mon, 26 January 2015 21:18
		Re: 3-way handshake not completed By: mlee (Kerio) on Wed, 28 January 2015 04:28
		Re: 3-way handshake not completed By: dllcoder on Wed, 27 January 2016 23:56

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