Changing listening ports with openSSH
i recently decided to turn my old desktop pc into a linux server where i can host my files etc. I followed a tutorial which used openssh and after installing it and configuring some files it works like a charm. I have a few questions though: the tutorial i followed here uses nc -v -z [addr] [port] to check if the ssh service is working on that port. However, no matter which port i use in the sshd_config file, it won't successfully listen on that port. Any ideas why?
PS: i'm a complete beginner to linux :)
*Running on Ubuntu 18.04LTS
networking server ssh
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
add a comment |
i recently decided to turn my old desktop pc into a linux server where i can host my files etc. I followed a tutorial which used openssh and after installing it and configuring some files it works like a charm. I have a few questions though: the tutorial i followed here uses nc -v -z [addr] [port] to check if the ssh service is working on that port. However, no matter which port i use in the sshd_config file, it won't successfully listen on that port. Any ideas why?
PS: i'm a complete beginner to linux :)
*Running on Ubuntu 18.04LTS
networking server ssh
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
Are you running thenccommand with the loopback address127.0.0.1as shown in the guide you linked? from where are you running the command?
– steeldriver
Feb 21 at 1:31
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42
add a comment |
i recently decided to turn my old desktop pc into a linux server where i can host my files etc. I followed a tutorial which used openssh and after installing it and configuring some files it works like a charm. I have a few questions though: the tutorial i followed here uses nc -v -z [addr] [port] to check if the ssh service is working on that port. However, no matter which port i use in the sshd_config file, it won't successfully listen on that port. Any ideas why?
PS: i'm a complete beginner to linux :)
*Running on Ubuntu 18.04LTS
networking server ssh
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
i recently decided to turn my old desktop pc into a linux server where i can host my files etc. I followed a tutorial which used openssh and after installing it and configuring some files it works like a charm. I have a few questions though: the tutorial i followed here uses nc -v -z [addr] [port] to check if the ssh service is working on that port. However, no matter which port i use in the sshd_config file, it won't successfully listen on that port. Any ideas why?
PS: i'm a complete beginner to linux :)
*Running on Ubuntu 18.04LTS
networking server ssh
networking server ssh
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
asked Feb 21 at 1:18
Stelios PapamichailStelios Papamichail
1134
1134
Are you running thenccommand with the loopback address127.0.0.1as shown in the guide you linked? from where are you running the command?
– steeldriver
Feb 21 at 1:31
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42
add a comment |
Are you running thenccommand with the loopback address127.0.0.1as shown in the guide you linked? from where are you running the command?
– steeldriver
Feb 21 at 1:31
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42
Are you running the
nc command with the loopback address 127.0.0.1 as shown in the guide you linked? from where are you running the command?– steeldriver
Feb 21 at 1:31
Are you running the
nc command with the loopback address 127.0.0.1 as shown in the guide you linked? from where are you running the command?– steeldriver
Feb 21 at 1:31
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42
add a comment |
1 Answer
1
active
oldest
votes
sshd, the ssh server, reads its config file (/etc/ssh/sshd_config) on sshd startup.
sudo service sshd restart
is one way to make this happen.
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which portsshdis listening to bysudo lsof -c sshd -a -i
– waltinator
Feb 22 at 14:54
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
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active
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votes
sshd, the ssh server, reads its config file (/etc/ssh/sshd_config) on sshd startup.
sudo service sshd restart
is one way to make this happen.
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which portsshdis listening to bysudo lsof -c sshd -a -i
– waltinator
Feb 22 at 14:54
add a comment |
sshd, the ssh server, reads its config file (/etc/ssh/sshd_config) on sshd startup.
sudo service sshd restart
is one way to make this happen.
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which portsshdis listening to bysudo lsof -c sshd -a -i
– waltinator
Feb 22 at 14:54
add a comment |
sshd, the ssh server, reads its config file (/etc/ssh/sshd_config) on sshd startup.
sudo service sshd restart
is one way to make this happen.
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
sshd, the ssh server, reads its config file (/etc/ssh/sshd_config) on sshd startup.
sudo service sshd restart
is one way to make this happen.
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
edited Feb 22 at 14:52
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
answered Feb 21 at 1:49
waltinatorwaltinator
22.9k74169
22.9k74169
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which portsshdis listening to bysudo lsof -c sshd -a -i
– waltinator
Feb 22 at 14:54
add a comment |
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which portsshdis listening to bysudo lsof -c sshd -a -i
– waltinator
Feb 22 at 14:54
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
No, it will not. It will cause it to no longer accept new sessions on the old port, but existing sessions will be allowed to proceed.
– Wouter Verhelst
Feb 21 at 9:01
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
So should i try this or is it "dangerous"?
– Stelios Papamichail
Feb 22 at 12:54
You should try it. What makes you think it's "dangerous"? You can see which port
sshd is listening to by sudo lsof -c sshd -a -i– waltinator
Feb 22 at 14:54
You should try it. What makes you think it's "dangerous"? You can see which port
sshd is listening to by sudo lsof -c sshd -a -i– waltinator
Feb 22 at 14:54
add a comment |
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Are you running the
nccommand with the loopback address127.0.0.1as shown in the guide you linked? from where are you running the command?– steeldriver
Feb 21 at 1:31
@steeldriver no,I'm using the local one and I'm running it from /home
– Stelios Papamichail
Feb 21 at 1:42