problem with iptables and ubuntu Ubuntu 13.10

did you install ipatbles?? or varified you have it on your OS? <br> <br>did you read this tut: <br> <br>https://www.digitalocean.com/community/articles/how-to-set-up-a-firewall-using-ip-tables-on-ubuntu-12-04 <br> <br>if you have done all, then do you use root as your user or custom user? <br> <br>if custom user, then make sure the user has privileges to execute commands.

@FMCB <br> <br>Yes iptables is installed, which makes me be able to see this error and i’m using root to execute them. <br> <br>

I had this problem earlier. In my case, the kernel I elected to use when booting my droplet was an older kernel. Then I performed various updates which included installing a newer kernel. When you do that, all the libraries are setup for the new kernel, but digital ocean doesn’t use the new kernel, it uses the one you specify in your droplet configuration. <br> <br>When I bumped the droplet configuration kernel up to the same one I had just updated to in my instance, iptables began to work again. <br> <br>Now here’s the key. When you get this working again, setup your kernel package to be “fixed” and not auto-upgradable. If you decide to upgrade, in the future, you have to do both, pick the droplet configuration kernel version you like, and then in your package manager, remove the old and pick the “fixed” package that exactly corresponds.