Well as you can see I can not set shorter password. I was looking in /etc/pam.d location or something but did not find anything related to pass settings 
Thank you for this tip, actually I have second router connected to my main router(from provider) and on this second router I have openwrt - I think I have seen there openvpn option - will check
I did not - thank you will try
for this I am using zerotier - and I can connect from outside but ... using IPs which is not great. Would like to use domains
nginxproxymanager
Well, I was trying to play with nginx proxy manager, was able to set this but still, could connect only from home network - not from outside
Right, silly me. Doing this as root solve an issue . Thank you