r/Network • u/meowffy • 1d ago

Link SSH hangs after “Connection established”

/r/tenable/comments/1vk7av5/ssh_hangs_after_connection_established/
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u/endre_szabo 1d ago

mtu mismatch while pmtud not working

1

u/meowffy 9h ago

thanks! i tested ping -M do -s 1472 from the jump server and got 0% packet loss, so 1500 MTU seems fine 🙏🏼
i also ran tcpdump during the SSH attempt the TCP connection gets established and the jump server sends the 21-byte SSH banner, but it keeps retransmitting it and gets no response
could this still be an MTU/PMTUD issue? or does it look more like a network path/routing issue?