> Either way, I think the possibility of an IPv6 problem is worth > investigating. Close all of your applications, then open two terminals. In > one, run: > > $ sudo tcpdump -nn port 443 > > In the other, run the same s_client command to connect to the python docs > server. Send us the output of tcpdump, describing both a successful and an > unsuccessful connection. 4 logs attached: - on_error104 and on_error104-vv (I also added -vv option to have verbose output). - on_success and on_sucess-vv (same) apparently, although I ticked "IPv4 required for this connexion", IPv6 is used. Frédéric
tcpdump: listening on enp62s0u1u4, link-type EN10MB (Ethernet), capture size 262144 bytes 05:44:02.086711 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 40) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [S], cksum 0xa71f (incorrect -> 0xaff0), seq 381705055, win 27920, options [mss 1396,sackOK,TS val 3208799896 ecr 0,nop,wscale 7], length 0 05:44:02.140275 IP6 (flowlabel 0xdafee, hlim 57, next-header TCP (6) payload length: 40) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [S.], cksum 0xdc44 (correct), seq 1546151322, ack 381705056, win 27360, options [mss 1380,sackOK,TS val 216598317 ecr 3208799896,nop,wscale 9], length 0 05:44:02.140357 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x7493), seq 1, ack 1, win 219, options [nop,nop,TS val 3208799949 ecr 216598317], length 0 05:44:02.184162 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 233) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [P.], cksum 0xa7e0 (incorrect -> 0x15a1), seq 1:202, ack 1, win 219, options [nop,nop,TS val 3208799993 ecr 216598317], length 201 05:44:02.241730 IP6 (flowlabel 0xdafee, hlim 57, next-header TCP (6) payload length: 1380) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [.], cksum 0xfeb8 (correct), seq 1:1349, ack 202, win 56, options [nop,nop,TS val 216598342 ecr 3208799993], length 1348 05:44:02.241838 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x6df2), seq 202, ack 1349, win 240, options [nop,nop,TS val 3208800051 ecr 216598342], length 0 05:44:02.242765 IP6 (flowlabel 0xdaf02, hlim 57, next-header TCP (6) payload length: 2472) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [P.], cksum 0xb09f (incorrect -> 0x9b37), seq 1349:3789, ack 202, win 56, options [nop,nop,TS val 216598342 ecr 3208799993], length 2440 05:44:02.242819 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x6443), seq 202, ack 3789, win 278, options [nop,nop,TS val 3208800052 ecr 216598342], length 0 05:44:02.244262 IP6 (flowlabel 0x91a5a, hlim 64, next-header TCP (6) payload length: 158) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [P.], cksum 0xa795 (incorrect -> 0x35ea), seq 202:328, ack 3789, win 278, options [nop,nop,TS val 3208800053 ecr 216598342], length 126 05:44:02.296568 IP6 (flowlabel 0x42594, hlim 57, next-header TCP (6) payload length: 20) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [R], cksum 0x4c0c (correct), seq 1546155111, win 0, length 0 05:44:02.298896 IP6 (flowlabel 0x42594, hlim 57, next-header TCP (6) payload length: 20) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [R], cksum 0x4c0c (correct), seq 1546155111, win 0, length 0 05:44:02.496722 IP6 (flowlabel 0xdafee, hlim 57, next-header TCP (6) payload length: 1124) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [P.], cksum 0xc107 (correct), seq 2697:3789, ack 202, win 56, options [nop,nop,TS val 216598406 ecr 3208800051], length 1092 05:44:02.496777 IP6 (flowlabel 0xf3509, hlim 64, next-header TCP (6) payload length: 20) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [R], cksum 0xa70b (incorrect -> 0xa9b2), seq 381705257, win 0, length 0 05:44:02.824027 IP6 (flowlabel 0x7cd00, hlim 57, next-header TCP (6) payload length: 1380) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [.], cksum 0x428a (correct), seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 216598488 ecr 3208800051], length 1348 05:44:02.824084 IP6 (flowlabel 0xf3509, hlim 64, next-header TCP (6) payload length: 20) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [R], cksum 0xa70b (incorrect -> 0xa9b2), seq 381705257, win 0, length 0 05:44:03.431547 IP6 (flowlabel 0xcf603, hlim 57, next-header TCP (6) payload length: 1380) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [.], cksum 0x41f2 (correct), seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 216598640 ecr 3208800051], length 1348 05:44:03.431590 IP6 (flowlabel 0xf3509, hlim 64, next-header TCP (6) payload length: 20) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [R], cksum 0xa70b (incorrect -> 0xa9b2), seq 381705257, win 0, length 0 05:44:04.651491 IP6 (flowlabel 0x44f02, hlim 57, next-header TCP (6) payload length: 1380) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [.], cksum 0x40c1 (correct), seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 216598945 ecr 3208800051], length 1348 05:44:04.651534 IP6 (flowlabel 0xf3509, hlim 64, next-header TCP (6) payload length: 20) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [R], cksum 0xa70b (incorrect -> 0xa9b2), seq 381705257, win 0, length 0 05:44:07.080227 IP6 (flowlabel 0x13602, hlim 57, next-header TCP (6) payload length: 1056) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056: Flags [.], cksum 0x6061 (correct), seq 1349:2373, ack 202, win 56, options [nop,nop,TS val 216599552 ecr 3208800051], length 1024 05:44:07.080272 IP6 (flowlabel 0xf3509, hlim 64, next-header TCP (6) payload length: 20) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60056 > 2a04:4e42:9::223.443: Flags [R], cksum 0xa70b (incorrect -> 0xa9b2), seq 381705257, win 0, length 0 21 packets captured 21 packets received by filter 0 packets dropped by kernel
# tcpdump -nn port 443 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on enp62s0u1u4, link-type EN10MB (Ethernet), capture size 262144 bytes 05:38:34.536393 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [S], seq 341004267, win 27920, options [mss 1396,sackOK,TS val 193352749 ecr 0,nop,wscale 7], length 0 05:38:34.588361 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [S.], seq 2353121035, ack 341004268, win 27360, options [mss 1380,sackOK,TS val 1661200257 ecr 193352749,nop,wscale 9], length 0 05:38:34.588477 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [.], ack 1, win 219, options [nop,nop,TS val 193352801 ecr 1661200257], length 0 05:38:34.633604 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [P.], seq 1:202, ack 1, win 219, options [nop,nop,TS val 193352846 ecr 1661200257], length 201 05:38:34.691070 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1:1349, ack 202, win 56, options [nop,nop,TS val 1661200282 ecr 193352846], length 1348 05:38:34.691202 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [.], ack 1349, win 240, options [nop,nop,TS val 193352904 ecr 1661200282], length 0 05:38:34.692050 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 1661200282 ecr 193352846], length 1348 05:38:34.692124 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [.], ack 2697, win 262, options [nop,nop,TS val 193352905 ecr 1661200282], length 0 05:38:34.693290 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [P.], seq 2697:3789, ack 202, win 56, options [nop,nop,TS val 1661200282 ecr 193352846], length 1092 05:38:34.693359 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [.], ack 3789, win 283, options [nop,nop,TS val 193352906 ecr 1661200282], length 0 05:38:34.694875 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [P.], seq 202:328, ack 3789, win 283, options [nop,nop,TS val 193352908 ecr 1661200282], length 126 05:38:34.745931 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [R], seq 2353123732, win 0, length 0 05:38:34.748264 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [R], seq 2353124824, win 0, length 0 05:38:34.749457 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [R], seq 2353124824, win 0, length 0 05:38:34.938558 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [P.], seq 2697:3789, ack 202, win 56, options [nop,nop,TS val 1661200344 ecr 193352904], length 1092 05:38:34.938616 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0 05:38:35.233371 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 1661200418 ecr 193352904], length 1348 05:38:35.233440 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0 05:38:35.825846 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 1661200566 ecr 193352904], length 1348 05:38:35.825902 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0 05:38:37.013369 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 1661200863 ecr 193352904], length 1348 05:38:37.013410 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0 05:38:39.385845 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:2373, ack 202, win 56, options [nop,nop,TS val 1661201456 ecr 193352904], length 1024 05:38:39.385889 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0 05:38:44.137038 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038: Flags [.], seq 1349:1861, ack 202, win 56, options [nop,nop,TS val 1661202644 ecr 193352904], length 512 05:38:44.137093 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60038 > 2a04:4e42:9::223.443: Flags [R], seq 341004469, win 0, length 0
tcpdump: listening on enp62s0u1u4, link-type EN10MB (Ethernet), capture size 262144 bytes 05:44:53.497892 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 40) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [S], cksum 0xa71f (incorrect -> 0xe0ca), seq 1194118223, win 27920, options [mss 1396,sackOK,TS val 4154219523 ecr 0,nop,wscale 7], length 0 05:44:53.551648 IP6 (flowlabel 0x2ddfb, hlim 57, next-header TCP (6) payload length: 40) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060: Flags [S.], cksum 0xaae9 (correct), seq 2329432500, ack 1194118224, win 27360, options [mss 1380,sackOK,TS val 1667233825 ecr 4154219523,nop,wscale 9], length 0 05:44:53.551700 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x4337), seq 1, ack 1, win 219, options [nop,nop,TS val 4154219577 ecr 1667233825], length 0 05:44:53.595504 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 233) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [P.], cksum 0xa7e0 (incorrect -> 0xb232), seq 1:202, ack 1, win 219, options [nop,nop,TS val 4154219620 ecr 1667233825], length 201 05:44:53.653031 IP6 (flowlabel 0x2ddfb, hlim 57, next-header TCP (6) payload length: 1380) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060: Flags [.], cksum 0xc00e (correct), seq 1:1349, ack 202, win 56, options [nop,nop,TS val 1667233850 ecr 4154219620], length 1348 05:44:53.653138 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x3c97), seq 202, ack 1349, win 240, options [nop,nop,TS val 4154219678 ecr 1667233850], length 0 05:44:53.654047 IP6 (flowlabel 0x2dd03, hlim 57, next-header TCP (6) payload length: 2472) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060: Flags [P.], cksum 0xb09f (incorrect -> 0x97c8), seq 1349:3789, ack 202, win 56, options [nop,nop,TS val 1667233850 ecr 4154219620], length 2440 05:44:53.654114 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x32e8), seq 202, ack 3789, win 278, options [nop,nop,TS val 4154219679 ecr 1667233850], length 0 05:44:53.655515 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 158) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [P.], cksum 0xa795 (incorrect -> 0xddaf), seq 202:328, ack 3789, win 278, options [nop,nop,TS val 4154219680 ecr 1667233850], length 126 05:44:53.710193 IP6 (flowlabel 0x2dd03, hlim 57, next-header TCP (6) payload length: 258) 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060: Flags [P.], cksum 0x550b (correct), seq 3789:4015, ack 328, win 56, options [nop,nop,TS val 1667233864 ecr 4154219680], length 226 05:44:53.750616 IP6 (flowlabel 0xc542a, hlim 64, next-header TCP (6) payload length: 32) 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60060 > 2a04:4e42:9::223.443: Flags [.], cksum 0xa717 (incorrect -> 0x3104), seq 328, ack 4015, win 299, options [nop,nop,TS val 4154219776 ecr 1667233864], length 0 11 packets captured 11 packets received by filter 0 packets dropped by kernel
# tcpdump -nn port 443 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on enp62s0u1u4, link-type EN10MB (Ethernet), capture size 262144 bytes 05:42:29.872818 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [S], seq 808480510, win 27920, options [mss 1396,sackOK,TS val 2276093981 ecr 0,nop,wscale 7], length 0 05:42:29.926388 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054: Flags [S.], seq 3967628715, ack 808480511, win 27360, options [mss 1380,sackOK,TS val 153203196 ecr 2276093981,nop,wscale 9], length 0 05:42:29.926457 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [.], ack 1, win 219, options [nop,nop,TS val 2276094034 ecr 153203196], length 0 05:42:29.971519 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [P.], seq 1:202, ack 1, win 219, options [nop,nop,TS val 2276094079 ecr 153203196], length 201 05:42:30.029149 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054: Flags [.], seq 1:1349, ack 202, win 56, options [nop,nop,TS val 153203222 ecr 2276094079], length 1348 05:42:30.029255 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [.], ack 1349, win 240, options [nop,nop,TS val 2276094137 ecr 153203222], length 0 05:42:30.030056 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054: Flags [.], seq 1349:2697, ack 202, win 56, options [nop,nop,TS val 153203222 ecr 2276094079], length 1348 05:42:30.030111 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [.], ack 2697, win 262, options [nop,nop,TS val 2276094138 ecr 153203222], length 0 05:42:30.031274 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054: Flags [P.], seq 2697:3789, ack 202, win 56, options [nop,nop,TS val 153203222 ecr 2276094079], length 1092 05:42:30.031321 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [.], ack 3789, win 283, options [nop,nop,TS val 2276094139 ecr 153203222], length 0 05:42:30.032860 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [P.], seq 202:328, ack 3789, win 283, options [nop,nop,TS val 2276094141 ecr 153203222], length 126 05:42:30.087479 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054: Flags [P.], seq 3789:4015, ack 328, win 56, options [nop,nop,TS val 153203237 ecr 2276094141], length 226 05:42:30.128603 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60054 > 2a04:4e42:9::223.443: Flags [.], ack 4015, win 305, options [nop,nop,TS val 2276094237 ecr 153203237], length 0 05:42:30.268753 IP6 2a04:4e42:9::223.443 > 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60052: Flags [.], seq 1311761769:1311762281, ack 2934981727, win 56, options [nop,nop,TS val 1660745428 ecr 3271150293], length 512 05:42:30.268791 IP6 2001:41d0:fe0b:8000:9a64:ff80:35b8:7d03.60052 > 2a04:4e42:9::223.443: Flags [R], seq 2934981727, win 0, length 0
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