On 27/09/2020 09:30, Chris Green wrote:

On Sun, Sep 27, 2020 at 08:47:59AM +0100, Nick Howitt wrote:
    On 26/09/2020 22:29, Chris Green wrote:

2020-09-26 16:24:54,531 fail2ban.utils          [1563]: ERROR   7f20226c35e0 --
stderr: 'modprobe: FATAL: Module ip_tables not found in directory /lib/modules/3
.10.107-xenU-36-37a7b05-x86_64'

    This is you problem. Are you using iptables as your firewall?
    Nick

Well, I don't know, I did say I was a total fail2ban newbie. :-)

I just did 'apt install fail2ban' and that's all, I did check that
fail2ban was running but no more.

So I guess you're saying that I need to install/configure something to
do with ip_tables, yes?

I have 'iptables' installed from the Ubuntu repositories.

Ah, looking at /lib/modules I don't have the one referenced above:-

     chris@isbdGandi$ ls -l /lib/modules
     total 20
     drwxr-xr-x 3 root root 4096 Jan  5  2017 3.10.103-xenU-33-adcc8c8-x86_64
     drwxr-xr-x 3 root root 4096 Jun 25  2017 3.10.105-xenU-34-082da8f-x86_64
     drwxr-xr-x 3 root root 4096 Sep 19  2014 3.10.42-xenU-12-e888729-x86_64
     drwxr-xr-x 3 root root 4096 Oct 22  2015 3.10.62-xenU-25-0e6777a-x86_64
     drwxr-xr-x 3 root root 4096 Oct 16  2016 3.10.99-xenU-26-7336ef7-x86_64

So how do I get the one that's needed?  What is it a part of?

I don't know Ubuntu/Debian at all so can't really advise. It look like those folders are related to your kernel. Probably your set up only keeps the last 5 kernels installed, so your running kernel 'uname -r' is probably older than any of these and is 3.10.107-xenU-36-37a7b05-x86_64.

Try rebooting. This should bring the latest kernel into play and it should then be able to find the module.



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