Hi Peter, it's not just you, I have similar problems since around July 1, but with a netcup server.
Since then, downloading a bigger file from the netcup server using scp or rsync fails pretty consistently. Normal ssh sessions or other stuff like imap or xmpp remain stable, as far as I can tell. I run the scp/rsync over wg, but it doesn't matter, happens over pppoe too. Like you, I also spent the last evenings looking for mistakes on my side, besides having this working for years. So now I guess the problem is on their side or somewhere in between? I see the following when the file transfer fails: 192.168.100.1 is my router, where I run "scp 192.168.100.2:dump.gz ." 192.168.100.2 is the netcup server 237470 28.285237 192.168.100.1 -> 192.168.100.2 TCP 56 12534 -> 22 [ACK] Seq=55922 Ack=195360998 Win=120512 Len=0 TSval=2630531475 TSecr=89901171 237471 28.285242 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237472 28.285260 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237473 28.285288 192.168.100.1 -> 192.168.100.2 TCP 56 12534 -> 22 [ACK] Seq=55922 Ack=195363734 Win=117824 Len=0 TSval=2630531475 TSecr=89901171 237474 28.285293 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237475 28.285311 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237476 28.285339 192.168.100.1 -> 192.168.100.2 TCP 56 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=115072 Len=0 TSval=2630531475 TSecr=89901171 237477 28.285348 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: [TCP Previous segment not captured] , Encrypted packet (len=1368) 237478 28.285382 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#1] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=115072 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195369206 237479 28.285498 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Window Update] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195369206 237480 28.285863 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237481 28.285906 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#2] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195370574 237482 28.285914 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237483 28.285941 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#3] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195371942 237484 28.285946 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237485 28.285973 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#4] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195373310 237486 28.285979 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237487 28.286006 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#5] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195374678 237488 28.286016 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237489 28.286044 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#6] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195376046 237490 28.286054 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: Encrypted packet (len=1368) 237491 28.286081 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#7] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=123264 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195377414 237492 28.286343 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Window Update] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=131456 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195377414 237493 28.286421 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Window Update] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=139648 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195377414 237494 28.287076 192.168.100.2 -> 192.168.100.1 TCP 56 22 -> 12534 [FIN, ACK] Seq=195377414 Ack=55922 Win=16384 Len=0 TSval=89901171 TSecr=2630531475 237495 28.287141 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Dup ACK 237476#8] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=139648 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195377414 237496 28.288062 192.168.100.1 -> 192.168.100.2 TCP 68 [TCP Window Update] 12534 -> 22 [ACK] Seq=55922 Ack=195366470 Win=147712 Len=0 TSval=2630531475 TSecr=89901171 SLE=195367838 SRE=195377414 237497 28.288586 192.168.100.1 -> 192.168.100.2 SSHv2 104 Client: Encrypted packet (len=36) 237498 28.295439 192.168.100.2 -> 192.168.100.1 SSHv2 1424 Server: [TCP Fast Retransmission] , Encrypted packet (len=1368) 237499 28.295555 192.168.100.1 -> 192.168.100.2 TCP 56 12534 -> 22 [ACK] Seq=55958 Ack=195377415 Win=136768 Len=0 TSval=2630531475 TSecr=89901171 237500 28.295820 192.168.100.1 -> 192.168.100.2 TCP 56 [TCP Window Update] 12534 -> 22 [ACK] Seq=55958 Ack=195377415 Win=144960 Len=0 TSval=2630531475 TSecr=89901171 237501 28.295917 192.168.100.1 -> 192.168.100.2 TCP 56 [TCP Window Update] 12534 -> 22 [ACK] Seq=55958 Ack=195377415 Win=147712 Len=0 TSval=2630531475 TSecr=89901171 237502 28.296168 192.168.100.1 -> 192.168.100.2 SSHv2 116 Client: Encrypted packet (len=60) 237503 28.296915 192.168.100.1 -> 192.168.100.2 TCP 56 12534 -> 22 [FIN, ACK] Seq=56018 Ack=195377415 Win=147712 Len=0 TSval=2630531475 TSecr=89901171 237504 28.297599 192.168.100.2 -> 192.168.100.1 TCP 44 22 -> 12534 [RST] Seq=195366470 Win=0 Len=0 237505 28.308039 192.168.100.2 -> 192.168.100.1 TCP 44 22 -> 12534 [RST] Seq=195377415 Win=0 Len=0 237506 28.308106 192.168.100.2 -> 192.168.100.1 TCP 44 22 -> 12534 [RST] Seq=195377415 Win=0 Len=0 237507 28.308129 192.168.100.2 -> 192.168.100.1 TCP 44 22 -> 12534 [RST] Seq=195377415 Win=0 Len=0 237508 28.308145 192.168.100.2 -> 192.168.100.1 TCP 44 22 -> 12534 [RST] Seq=195377415 Win=0 Len=0
