[gravi123]

Is it possible to change the kick message for nonsteam users trying to connect to server or at least output something in console.

This servers accepts only legit clients. Go and buy it right now at http://store.steampowered.com/app/10

[gabuch2]

By default "Steam Validation Rejected" is shown to non-steam users when trying to connect. However, you can one of the popular Dual Protocol plugins (won't name them here because it's against AlliedModders rules) to create a custom message.

The cvars are
dp_rejmsg_nosteam47
dp_rejmsg_nosteam48
dp_rejmsg_revemu
dp_rejmsg_revemu2013
dp_rejmsg_steamemu
dp_rejmsg_oldrevemu
dp_rejmsg_avsmp
dp_rejmsg_revemu_sc2
dp_rejmsg_sxei

You must configure this plugin to deny access to your server (value "5", deprecated) and the custom message depending on the protocol will be shown.