[sagher]

hello all experts. few days ago i do install "ufw" iptable rules app in my vps. but after done all settings and try to enable the ufw i got these errors and the application is not running..

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Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
root@kvm-************:~# ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
ERROR: problem running ufw-init
iptables-restore: line 2 failed
ip6tables-restore: line 2 failed

This is my machine

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root@***************:~# uname -a
Linux kvm-********* 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3~deb8u1 (2015-04-24) x86_64 GNU/Linux

Kindly help me to resolve this issue. due to this issue many of my server ports are misbehave or blocked