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I have two computers (both running Ubuntu) in the same network. They are able to ping each other successfully. Their IPs are:
Computer 1: 172.16.10.59
Computer 2: 172.16.10.72
The following works: Listening on Computer 1 on a random port (let's say 1234), and establishing a connection from Computer 2 to Computer 1. I can use netcat like a chat program then (as expected).
On computer 1:
$ nc -l 1234
On computer 2:
$ nc 172.16.10.59 1234
But vice-versa doesn't work: Listening on Computer 2 on the same port (1234), and establishing a connection from Computer 1 to Computer 2.
On computer 2:
$ nc -l 1234
On computer 1:
$ nc 172.16.10.72 1234
All that happens is that netcat runs on both computers, but when I type in a message in either computer and hit enter, it isn't displayed on the other computer at all.
I'm quite lost in what could be wrong here, and I couldn't find a working solution online so far. Is anyone here able to help me? Thank you!
Nooyi
Posted 2019-07-24T11:32:35.127
Reputation: 1
Firewall on Computer 2? – Kamil Maciorowski – 2019-07-24T11:46:26.737
I already deactivated ufw and sudo ufw status returns "Status: inactive" – Nooyi – 2019-07-24T11:53:52.040
Could something else be running on port 1234 on the second computer? A suspended netcat process perhaps? – Cliff Armstrong – 2019-07-24T15:27:38.087
@anyone who comes across the same problem, Shubham Abrol's answer to this question worked for me https://askubuntu.com/questions/572848/network-manager-not-working
– Nooyi – 2019-07-26T11:03:41.563