Question

Trouble connection to certain droplets when connected to VPN server droplet

Here is an interesting little problem I am having. Kudos to anyone who can clue me in to an answer:

Background: All my droplets are Ubuntu 14.04 All are based in San Francisco All up to date and running fine for at least a month

The problem: Recently I set up OpenVPN on a droplet, and connect to that vpn from home. Works great for the last week. No problems with the VPN or droplet or home network. I keep the VPN connected at all times for various reasons.

Yesterday I needed to ssh in to another droplet (webserver), but encountered this error:

ssh_exchange_identification: read: Connection reset by peer

If I disconnect from the VPN, I can ssh in fine to that droplet.

I tried a few other droplets I manage, and some of them will ssh fine while on the VPN, and some will not. The common factor for the non-connecting ones seems to be the subnet of the droplet: 255.255.240.0 which is the same subnet of the droplet that I have OpenVPN running on.

So, in summary: Droplets that have the same subnet of my VPN server will not allow me to connect while I am connected to the VPN.

Droplets on a different subnet will connect fine.

Are there some rules I can add to my VPN config that will allow me to ssh to droplets within the same subnet?

Thanks in advance!!

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This question was answered by @sierracircle:

Found a solution:

on the droplets I am trying unsuccessfully to ssh into:

add the IP address of the VPN server to /etc/hosts.allow like this:

sshd:  my.vpn.ip.address

no need to restart anything…I can now ssh to my droplets when connected to the VPN, even if the droplets have the same subnet

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