PPTP login not possible

Hi,

I tried to set up a PPTP Connection, but it does not allow me to login. Any help?
I created my Network connection manual on windows 8.1.
What parameters do I have to use?

Protocol:

2015:01:25-20:44:04 CoroUTM pptpd[22815]: MGR: Manager process started
2015:01:25-20:44:04 CoroUTM pptpd[22815]: MGR: Maximum of 253 connections available
2015:01:25-20:47:14 ConoUTM pptpd[22998]: CTRL: Client 178.126.272.143 control connection started
2015:01:25-20:47:14 ConoUTM pptpd[22998]: CTRL: Starting call (launching pppd, opening GRE)
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: Plugin aua.so loaded.
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: AUA plugin initialized.
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: Plugin dhcpc.so loaded.
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: DHCPC: plugin initialized
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: pppd 2.4.5 started by (unknown), uid 0
2015:01:25-20:47:14 ConoUTM pppd-pptp[22999]: Starting negotiation on /dev/pts/0
2015:01:25-20:47:14 ConoUTM pptpd[22998]: GRE: Bad checksum from pppd.
2015:01:25-20:47:17 ConoUTM pptpd[22998]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
2015:01:25-20:47:19 ConoUTM pppd-pptp[22999]: Peer thomas failed CHAP authentication
2015:01:25-20:47:19 ConoUTM pppd-pptp[22999]: Connection terminated.
2015:01:25-20:47:19 ConoUTM pppd-pptp[22999]: Exit.
2015:01:25-20:47:19 ConoUTM pptpd[22998]: GRE: read(fd=6,buffer=805a540,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
2015:01:25-20:47:19 ConoUTM pptpd[22998]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
2015:01:25-20:47:19 ConoUTM pptpd[22998]: CTRL: Reaping child PPP[22999]
2015:01:25-20:47:19 ConoUTM pptpd[22998]: CTRL: Client 178.126.272.143 control connection finished 


Thanks

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