My colleague and I are on the same local network, trying to connect to our office headquarter's VPN. Any of us can connect without trouble, but when we try together, the second computer fails to connect.
Our configs are 13.04 and 13.10. My colleague tried with a Fedora distro, which produced the same error.
When we try with Windows PC or Android smartphone, everything works fine.
Any help is welcome.
edit:
More details:
We both use the native VPN that we activate via the VPN Connections menu in the network menu, top right corner of the default Unity desktop.
We both have different logins/keys to connect.
So both of your side works.
That is a common thing when using VPN. At our office regardless of who it is and what operating system we have the following happen:
They probably need to fix this for you. It is probably a configuration in the VPN that prevents the 2nd one from logging in.
A more specific answer probably relies on the type/brand of VPN used.