SSH tunnel and reverse SSH tunnel at the same time on the same port
2
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 Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
add a comment |
2
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 Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
Dec 19 '18 at 20:27
add a comment |
2
2
2
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 Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
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 Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
asked Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
asked Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
asked Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
asked Dec 19 '18 at 19:33
Bonjour123Bonjour123
133
133
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
Dec 19 '18 at 20:27
add a comment |
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
Dec 19 '18 at 20:27
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
Dec 19 '18 at 20:27
Is there any service on public_IP_of_B on port 20000 listening? If yes - is it reachable from serverB?
– Tomek
Dec 19 '18 at 20:27
add a comment |
1 Answer
1
active
oldest
votes
4
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 Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
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
Dec 19 '18 at 20:51
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
4
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 Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
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
Dec 19 '18 at 20:51
add a comment |
4
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 Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
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
Dec 19 '18 at 20:51
add a comment |
4
4
4
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 Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
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 Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
answered Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
answered Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
answered Dec 19 '18 at 20:34
kasperdkasperd
26.1k115098
26.1k115098
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
Dec 19 '18 at 20:51
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
Dec 19 '18 at 20:51
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
Dec 19 '18 at 20:51
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
Dec 19 '18 at 20:51
add a comment |
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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
Dec 19 '18 at 20:27