tcp-mss mis match .. would this cause this problem

Unanswered Question
Sep 15th, 2008

So, I have a PC that is trying to https to an outside IP address. I can telnet to the IP in question on port 443 but my browser can't connect via https. This is the traffic capture from my FW.

sh cap capin

8 packets captured

1: 09:45:16.617949 10.x.x.x.1110 > 208.66.255.236.443: S 3587362937:3587362937(0) win 64240 <mss 1460,nop,nop,sackOK>

2: 09:45:16.633817 208.66.255.236.443 > 10.x.x.x.1110: S 2655106766:2655106766(0) ack 3587362938 win 5840 <mss 1300>

3: 09:45:16.634564 10.x.x.x.1110 > 208.66.255.236.443: . ack 2655106767 win 64240

4: 09:45:16.636197 10.x.x.x.1110 > 208.66.255.236.443: R 3587362938:3587362938(0) win 0

5: 09:46:39.512531 10.x.x.x.1112 > 208.66.255.236.443: S 32691742:32691742(0) win 64240 <mss 1460,nop,nop,sackOK>

6: 09:46:39.555833 208.66.255.236.443 > 10.x.x.x.1112: S 3794255628:3794255628(0) ack 32691743 win 5840 <mss 1300>

7: 09:46:39.556154 10.x.x.x.1112 > 208.66.255.236.443: . ack 3794255629 win 64240

8: 09:46:39.557725 10.x.x.x.1112 > 208.66.255.236.443: R 32691743:32691743(0) win 0

Please let me know if I should adjust something on my side.

Thanks

I have this problem too.
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scottmac Mon, 09/15/2008 - 09:53

Sounds like an MTU issue. SOmewhere the data hits a smaller MTU and is fragmented (and encrypted stuff (and most/all routing protocols) don't tolerate fragmentation.

Good Luck

Scott

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