I'm trying to get a PPTP server running on a ubuntu server, but I've run into some issues with it. I followed this guide on how to set up pptpd on my server, and everything went smooth, but when I try to connect with my mac, it gives me this error:

Here's my configuration:

Does anyone have any idea as to what I'm doing wrong here?

Update: Here's what the pptpd.log has to say about it:

steve@debian:~$ sudo tail /var/log/pptpd.log 
sudo: unable to resolve host debian
Sep  3 21:46:43 debian pptpd[2485]: MGR: Manager process started
Sep  3 21:46:43 debian pptpd[2485]: MGR: Maximum of 11 connections available
Sep  3 21:46:43 debian pptpd[2485]: MGR: Couldn't create host socket
Sep  3 21:46:43 debian pptpd[2485]: createHostSocket: Address already in use
Sep  3 21:46:56 debian pptpd[2486]: CTRL: Client 192.168.1.101 control connection started
Sep  3 21:46:56 debian pptpd[2486]: CTRL: Starting call (launching pppd, opening GRE)
Sep  3 21:46:56 debian pptpd[2486]: GRE: read(fd=6,buffer=204d0,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Sep  3 21:46:56 debian pptpd[2486]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Sep  3 21:46:56 debian pptpd[2486]: CTRL: Reaping child PPP[2487]
Sep  3 21:46:56 debian pptpd[2486]: CTRL: Client 192.168.1.101 control connection finished

My pptpd options are:

asyncmap 0
noauth
crtscts
lock
hide-password
modem
debug
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4
nopix