SSH tunnel and reverse SSH tunnel at the same time on the same port
1
I have a computer A, a server B (Azure VM) and a second computer C. I want to connect from A to C through the server B.
Setup:
A: ssh -i location_of_private_key -L 12000:public_IP_of_B:20000 user@serverB
C: ssh -i location_of_private_key -R 20000:localhost:12000 user@serverB
Testing:
A: nc localhost 12000
C: nc -l 12000
But the first testing command (in A) fails, I can't establish connection to B on port 20000.
What am I missing ?
port-forwarding ssh-tunnel netcat
asked yesterday
Bonjour123
82
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add a comment |
1
I have a computer A, a server B (Azure VM) and a second computer C. I want to connect from A to C through the server B.
Setup:
A: ssh -i location_of_private_key -L 12000:public_IP_of_B:20000 user@serverB
C: ssh -i location_of_private_key -R 20000:localhost:12000 user@serverB
Testing:
A: nc localhost 12000
C: nc -l 12000
But the first testing command (in A) fails, I can't establish connection to B on port 20000.
What am I missing ?
port-forwarding ssh-tunnel netcat
asked yesterday
Bonjour123
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday
add a comment |
1
1
1
I have a computer A, a server B (Azure VM) and a second computer C. I want to connect from A to C through the server B.
Setup:
A: ssh -i location_of_private_key -L 12000:public_IP_of_B:20000 user@serverB
C: ssh -i location_of_private_key -R 20000:localhost:12000 user@serverB
Testing:
A: nc localhost 12000
C: nc -l 12000
But the first testing command (in A) fails, I can't establish connection to B on port 20000.
What am I missing ?
port-forwarding ssh-tunnel netcat
asked yesterday
Bonjour123
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a computer A, a server B (Azure VM) and a second computer C. I want to connect from A to C through the server B.
Setup:
A: ssh -i location_of_private_key -L 12000:public_IP_of_B:20000 user@serverB
C: ssh -i location_of_private_key -R 20000:localhost:12000 user@serverB
Testing:
A: nc localhost 12000
C: nc -l 12000
But the first testing command (in A) fails, I can't establish connection to B on port 20000.
What am I missing ?
port-forwarding ssh-tunnel netcat
port-forwarding ssh-tunnel netcat
asked yesterday
Bonjour123
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Bonjour123
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Bonjour123
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
Bonjour123
82
asked yesterday
Bonjour123
82
82
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Bonjour123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday
add a comment |
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday
add a comment |
1 Answer
1
active
oldest
votes
3
You are making a couple of mistakes:
- Port forwardings by default listen only on
localhostso that's what you have to connect to in the first command. - You need to start the listener before you try to connect to it.
Fix those two mistakes and it should work.
answered yesterday
kasperd
26k115098
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
add a comment |
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1 Answer
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1 Answer
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3
You are making a couple of mistakes:
- Port forwardings by default listen only on
localhostso that's what you have to connect to in the first command. - You need to start the listener before you try to connect to it.
Fix those two mistakes and it should work.
answered yesterday
kasperd
26k115098
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
add a comment |
3
You are making a couple of mistakes:
- Port forwardings by default listen only on
localhostso that's what you have to connect to in the first command. - You need to start the listener before you try to connect to it.
Fix those two mistakes and it should work.
answered yesterday
kasperd
26k115098
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
add a comment |
3
3
3
You are making a couple of mistakes:
- Port forwardings by default listen only on
localhostso that's what you have to connect to in the first command. - You need to start the listener before you try to connect to it.
Fix those two mistakes and it should work.
answered yesterday
kasperd
26k115098
You are making a couple of mistakes:
- Port forwardings by default listen only on
localhostso that's what you have to connect to in the first command. - You need to start the listener before you try to connect to it.
Fix those two mistakes and it should work.
answered yesterday
kasperd
26k115098
answered yesterday
kasperd
26k115098
answered yesterday
kasperd
26k115098
answered yesterday
kasperd
26k115098
26k115098
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
add a comment |
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
Whoo, I was 10000% sure I had also tried to start the listener first (this is quite logical ^^). But maybe I had another mistake somewhere else. Anyway, thanks a lot, this fixed my problem ! :)
– Bonjour123
yesterday
add a comment |
Bonjour123 is a new contributor. Be nice, and check out our Code of Conduct.
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Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
yesterday