Сервер начал внезапно сбрасывать соединение, если начинаешь что-то загружать больше чем 10 байтов. Если клиенту отдать например «hello world», то нормально, если что-то больше (точно не проверял, но где то по ощущениям килобайт) - соединение висит и приходит RST пакет. Работал годами в этой конфигурации, ничего не менял.
Когда 15kb скачает, когда 40kb и отваливается
tcpdump -n -i eth0 host client and port not 22
05:54:43.180201 IP client.16239 > server.443: Flags [S], seq 4116473154, win 8760, options [mss 1390,nop,wscale 8,nop,nop,sackOK], length 0
05:54:43.180240 IP server.443 > client.16239: Flags [S.], seq 4168317543, ack 4116473155, win 64240, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
05:54:43.321936 IP client.16239 > server.443: Flags [.], ack 1, win 34, length 0
05:54:43.327251 IP client.16239 > server.443: Flags [P.], seq 1:366, ack 1, win 34, length 365
05:54:43.327283 IP server.443 > client.16239: Flags [.], ack 366, win 501, length 0
05:54:43.327604 IP server.443 > client.16239: Flags [P.], seq 1:110, ack 366, win 501, length 109
05:54:43.471964 IP client.16239 > server.443: Flags [P.], seq 366:417, ack 110, win 33, length 51
05:54:43.473029 IP client.16239 > server.443: Flags [P.], seq 417:515, ack 110, win 33, length 98
05:54:43.473133 IP server.443 > client.16239: Flags [.], ack 515, win 501, length 0
05:54:43.473292 IP server.443 > client.16239: Flags [P.], seq 110:2890, ack 515, win 501, length 2780
05:54:43.473301 IP server.443 > client.16239: Flags [P.], seq 2890:5670, ack 515, win 501, length 2780
05:54:43.473315 IP server.443 > client.16239: Flags [P.], seq 5670:8450, ack 515, win 501, length 2780
05:54:43.614711 IP client.16239 > server.443: Flags [.], ack 2890, win 34, length 0
05:54:43.614748 IP server.443 > client.16239: Flags [P.], seq 8450:11230, ack 515, win 501, length 2780
05:54:43.616821 IP client.16239 > server.443: Flags [.], ack 5670, win 34, length 0
05:54:43.616852 IP server.443 > client.16239: Flags [P.], seq 11230:12620, ack 515, win 501, length 1390
05:54:43.618953 IP client.16239 > server.443: Flags [.], ack 8450, win 34, length 0
05:54:43.618987 IP server.443 > client.16239: Flags [P.], seq 12620:15400, ack 515, win 501, length 2780
05:54:43.618994 IP server.443 > client.16239: Flags [.], seq 15400:16790, ack 515, win 501, length 1390
05:54:43.776733 IP client.16239 > server.443: Flags [.], ack 11230, win 34, length 0
05:54:43.776767 IP server.443 > client.16239: Flags [P.], seq 16790:19570, ack 515, win 501, length 2780
05:54:43.779979 IP client.16239 > server.443: Flags [.], ack 14010, win 34, length 0
05:54:43.780007 IP server.443 > client.16239: Flags [P.], seq 19570:20960, ack 515, win 501, length 1390
05:54:43.805039 IP client.16239 > server.443: Flags [.], ack 16790, win 70, length 0
05:54:43.805071 IP server.443 > client.16239: Flags [P.], seq 20960:23740, ack 515, win 501, length 2780
05:54:43.805079 IP server.443 > client.16239: Flags [.], seq 23740:25130, ack 515, win 501, length 1390
05:54:43.805083 IP server.443 > client.16239: Flags [P.], seq 25130:27910, ack 515, win 501, length 2780
05:54:43.805242 IP server.443 > client.16239: Flags [P.], seq 27910:29300, ack 515, win 501, length 1390
05:54:43.805253 IP server.443 > client.16239: Flags [P.], seq 29300:32080, ack 515, win 501, length 2780
05:54:43.805283 IP server.443 > client.16239: Flags [.], seq 32080:33470, ack 515, win 501, length 1390
05:54:44.121039 IP server.443 > client.16239: Flags [.], seq 32080:33470, ack 515, win 501, length 1390
05:54:44.537009 IP server.443 > client.16239: Flags [.], seq 16790:18180, ack 515, win 501, length 1390
05:54:45.369055 IP server.443 > client.16239: Flags [.], seq 16790:18180, ack 515, win 501, length 1390
05:54:47.001053 IP server.443 > client.16239: Flags [.], seq 16790:18180, ack 515, win 501, length 1390
05:54:50.361047 IP server.443 > client.16239: Flags [.], seq 16790:18180, ack 515, win 501, length 1390
05:54:53.779507 IP server.443 > client.16239: Flags [R.], seq 33470, ack 515, win 501, length 0
