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my mysql port 3306 was not accessible on one of my virtual machines runing Ubuntu 14.04 LTS. To fix it i entered

sudo ufw diable

and got the answer:

Firewall stopped and disabled on system startup

then the port 3306 is accessible via telnet from a remote system. After a while (reboot?) the access is again not possible.

What might be going on here and how can i debug/fix this?

says

sudo ufw allow out 3306/tcp  
sudo ufw allow in 3306/tcp  

should work as a workaround. The strange thing is - only if I do

sudo ufw disable

will the port be accessible for while.

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sudo ufw allow mysql is the work around i used since i only got a downvote for my question so far

https://stackoverflow.com/questions/41319291/ufw-blocks-most-ports-until-disabled-and-re-enabled-after-reboot

seems to have a similar quirk with ufw

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