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We are using ubuntu 14.04 and successfully installed nxfilter latest version. When I run the ./startup.sh script file then getting below error:

INFO - ResolverMan.create_resolver, Resolving DNS server : [8.8.8.8,   8.8.4.4]
INFO - Reset user_quota.
INFO - Loading user_quota.
INFO - RequestHandler started.
INFO - UdpServer started.
ERROR - UdpServer: java.net.BindException: Address already in use
INFO - Couldn't bind UDP 53. You might want to check your permission!
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  • Ubuntu runs dnsmasq as a local DNS resolver, so that will likely already be bound to port 53 – steeldriver May 27 '16 at 10:32
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You need to disable Dnsmasq.

You need to edit /etc/NetworkManager/NetworkManager.conf file

gksudo gedit /etc/NetworkManager/NetworkManager.conf

and comment out the following line from

dns=dnsmasq

to

#dns=dnsmasq

Save and exit the file

Now you need to network-manager using the following command or just reboot

sudo restart network-manager

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