What is the meaning of message debug2: channel 0: window 1998646 sent adjust 98506 in OpenSSH?

patrik

12/23/22, 8:16 AM

I get some kind of weird problems with a server randomly closes the connection. I am on client side, so fixing the server is not really my problem, but I see some kind of odd TCP communication. It might be worth to mention that the protocol is NETCONF over SSH, using OpenSSH client.

Not much out of order is seen when running ssh -vvv, except for a some messages like

debug2: channel 0: window 1998646 sent adjust 98506

Anyone who knows about what this mean (not the details regarding the actual feature, which are described here, https://datatracker.ietf.org/doc/html/rfc4254#section-5.2, but rather the particulars)? Also, in this case is the OpenSSH client senting or recieving?

I also see this kind of messages in the PCAP log. Payload is always 36 bytes and since the SSH is encrypted, I would assume the "payload" in this case means SSH data, regardless of content (which would also include SSH headers, etc.). How can I know the size of the window adjust message (IP addresses scrambled)?

"11499","2021-08-18 18:06:42.940955","a:b:c::d","d:c:b::a","TCP","108","36360 → 830 [PSH, ACK] Seq=901 Ack=2854573 Win=1412 Len=36 TSval=3002995779 TSecr=2976836203".

BR
Patrik

376

0 + 0

ssh

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: What is the meaning of message debug2: channel 0: window 1998646 sent adjust 98506 in OpenSSH?

TH: ความหมายของข้อความ debug2: ช่อง 0: หน้าต่าง 1998646 ส่งปรับ 98506 ใน OpenSSH คืออะไร

RO: Care este semnificația mesajului debug2: canal 0: fereastra 1998646 trimisă ajusta 98506 în OpenSSH?

RU: Что означает сообщение debug2: канал 0: окно 1998646 отправило настройку 98506 в OpenSSH?

VI: Ý nghĩa của thông báo debug2: kênh 0: cửa sổ 1998646 đã gửi điều chỉnh 98506 trong OpenSSH là gì?

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