I have a very strange problem, which may well not actually be a Lede problem, but I would be grateful for any help in diagnosing it.
When I go to https://vehicletax.service.gov.uk/ in Firefox it shows 'Performing a TLS Handshake to vehicletax.service.gov.uk' for a little while then fails saying 'Secure Connection Failed, The connection to the server was reset while the page was loading'. A similar thing happens in Google Chrome. Also it happens on two machines, one running Ubuntu 18.04 and the other 18.10.
However, if I connect via a VPN that I run (in the UK) then it connects ok, which suggests it is something to do with the router or connection to the internet. Also if I connect my phone to the router wifi then it also has the problem, but if I connect the phone using mobile data then it is ok.
I am running LEDE Reboot 17.01.2 r3435-65eec8bd5f on a Plusnet router which is actually a BT Home Hub 5A. I have not touched the router for months and this problem has only just appeared. I have tried a reboot.
I have had a go with tcpdump on the PC and using sudo tcpdump host vehicletax.service.gov.uk I see this. (I have inserted line feeds between each transaction to make it a bit easier to read).
11:44:04.711668 IP tigger.33584 > 107.162.132.57.https: Flags [S], seq 1219288911, win 29200, options [mss 1460,sackOK,TS val 270762524 ecr 0,nop,wscale 7], length 0
11:44:04.725582 IP 107.162.132.57.https > tigger.33584: Flags [S.], seq 2537281460, ack 1219288912, win 4356, options [mss 1460,sackOK,eol], length 0
11:44:04.725596 IP tigger.33584 > 107.162.132.57.https: Flags [.], ack 1, win 29200, length 0
11:44:04.725764 IP tigger.33584 > 107.162.132.57.https: Flags [P.], seq 1:235, ack 1, win 29200, length 234
11:44:04.739037 IP 107.162.132.57.https > tigger.33584: Flags [.], ack 235, win 4590, length 0
At this point there is several seconds wait
11:44:08.738918 IP 107.162.132.57.https > tigger.33584: Flags [R.], seq 1, ack 235, win 4590, length 0
11:44:08.739859 IP tigger.33590 > 107.162.132.57.https: Flags [S], seq 3421144022, win 29200, options [mss 1460,sackOK,TS val 270766552 ecr 0,nop,wscale 7], length 0
11:44:08.751098 IP 107.162.132.57.https > tigger.33590: Flags [S.], seq 2514563206, ack 3421144023, win 4356, options [mss 1460,sackOK,eol], length 0
11:44:08.751163 IP tigger.33590 > 107.162.132.57.https: Flags [.], ack 1, win 29200, length 0
11:44:08.751774 IP tigger.33590 > 107.162.132.57.https: Flags [P.], seq 1:235, ack 1, win 29200, length 234
11:44:08.762568 IP 107.162.132.57.https > tigger.33590: Flags [.], ack 235, win 4590, length 0
Then there is another wait and the last five lines are repeated. It repeats this a few more times then fails.
When I connect through the VPN and repeat the exercise I see
11:35:24.829072 IP tigger.55710 > 107.162.132.57.https: Flags [S], seq 822655265, win 29200, options [mss 1460,sackOK,TS val 801822720 ecr 0,nop,wscale 7], length 0
11:35:24.862589 IP 107.162.132.57.https > tigger.55710: Flags [S.], seq 2005228617, ack 822655266, win 4104, options [mss 1368,sackOK,eol], length 0
11:35:24.862608 IP tigger.55710 > 107.162.132.57.https: Flags [.], ack 1, win 29200, length 0
11:35:24.862784 IP tigger.55710 > 107.162.132.57.https: Flags [P.], seq 1:235, ack 1, win 29200, length 234
11:35:24.888874 IP 107.162.132.57.https > tigger.55710: Flags [.], ack 235, win 4338, length 0
This time there is no delay at this point
11:35:24.890242 IP 107.162.132.57.https > tigger.55710: Flags [P.], seq 1:103, ack 235, win 4338, length 102
11:35:24.890250 IP tigger.55710 > 107.162.132.57.https: Flags [.], ack 103, win 29200, length 0
and the communication continues.
I have run tcpdump in the router watching the internet port and it appears to show the same packets.
With my limited knowledge it looks as if there is a packet missing from the server back to me, but hopefully someone with more knowledge will be able to throw some more light on this.