SSH to EC2 host with Jumbox in between does not respond

Build Environment
#1

Hi All,

We are facing a weird issue where when we try to ssh to our EC2 host with a jumpbox in between, the connection to EC2 happens but never responds. What I mean is that when the ssh command executes, I see a sshd: [accepted] and sshd: [net] processes spin up but the connection never responds back and it eventually timesout. I have added the ssh key to the hosts and jumpbox and also using add_ssh_keys in the job. Even when we try to execute the command after ssh (like ls -ltr), it does not execute.

Below is the output of command using -vvv flag

#2

We are facing a weird issue where when we try to ssh to our EC2 host with a jumpbox in between, the connection to EC2 happens but never responds.

I’m a bit confused here, where does CircleCI fit into this picture?

It looks like your output was cut off, could you try to add it again?

#3

I am running the ssh command from circleci job. When the ssh command executes, it makes the connection to the server - from log debug1: Connection established.
Then further down it i authenticated by the server debug1: Authentication succeeded (publickey).
But then after this the connection never happens, it just hangs with below in the log (-vvv option)
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0

When I run the ssh command using -n (along with -vvv), i get few more lines and then connection is exited

debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug2: channel 0: read<=0 rfd 5 len 0
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug3: send packet: type 96
debug2: channel 0: input drain -> closed
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 96
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1]
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cc -1)
debug3: send packet: type 1
Transferred: sent 3160, received 2732 bytes, in 0.4 seconds
Bytes per second: sent 8719.4, received 7538.4
debug1: Exit status 0

#4

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