PPTP from iPhone WIFI fails GMS works

The PPTP work over GSM, as soon as I try to connect over WIFI connections the PPTP fails:

2012:01:13-13:02:00 tonick pptpd[21786]: MGR: Launching /usr/sbin/pptpctrl to handle client
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: local address = 10.242.1.1
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: remote address = 10.242.1.2
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Client 188.61.231.20 control connection started
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Received PPTP Control Message (type: 1)
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Made a START CTRL CONN RPLY packet
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: I wrote 156 bytes to the client.
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Sent packet to client
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Received PPTP Control Message (type: 7)
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Set parameters to 100000000 maxbps, 64 window size
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Made a OUT CALL RPLY packet
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Starting call (launching pppd, opening GRE)
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: pty_fd = 6
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: tty_fd = 7
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: I wrote 32 bytes to the client.
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Sent packet to client
2012:01:13-13:02:00 tonick pptpd[21787]: CTRL (PPPD Launcher): program binary = /usr/sbin/pppd
2012:01:13-13:02:00 tonick pptpd[21787]: CTRL (PPPD Launcher): local address = 10.242.1.1
2012:01:13-13:02:00 tonick pptpd[21787]: CTRL (PPPD Launcher): remote address = 10.242.1.2
2012:01:13-13:02:00 tonick pppd-pptp[21787]: Plugin aua.so loaded.
2012:01:13-13:02:00 tonick pppd-pptp[21787]: AUA plugin initialized.
2012:01:13-13:02:00 tonick pppd-pptp[21787]: pppd 2.4.5 started by (unknown), uid 0
2012:01:13-13:02:00 tonick pppd-pptp[21787]: using channel 23
2012:01:13-13:02:00 tonick pppd-pptp[21787]: Starting negotiation on /dev/ttyp0
2012:01:13-13:02:00 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:00 tonick pptpd[21786]: GRE: Bad checksum from pppd.
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Received PPTP Control Message (type: 15)
2012:01:13-13:02:00 tonick pptpd[21786]: CTRL: Got a SET LINK INFO packet with standard ACCMs
2012:01:13-13:02:00 tonick pptpd[21786]: GRE: buffering packet #1 (expecting #0, lost or reordered)
2012:01:13-13:02:03 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:03 tonick pptpd[21786]: GRE: timeout waiting for 1 packets
2012:01:13-13:02:03 tonick pptpd[21786]: GRE: accepting #1 from queue
2012:01:13-13:02:03 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:03 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:03 tonick pptpd[21786]: GRE: accepting packet #2
2012:01:13-13:02:03 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:03 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:06 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:06 tonick pptpd[21786]: GRE: accepting packet #3
2012:01:13-13:02:06 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:06 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:09 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:10 tonick pptpd[21786]: GRE: accepting packet #4
2012:01:13-13:02:10 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:10 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:12 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:13 tonick pptpd[21786]: GRE: accepting packet #5
2012:01:13-13:02:13 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:13 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:15 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:16 tonick pptpd[21786]: GRE: accepting packet #6
2012:01:13-13:02:16 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:16 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:18 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:19 tonick pptpd[21786]: GRE: accepting packet #7
2012:01:13-13:02:19 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:19 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:21 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:22 tonick pptpd[21786]: GRE: accepting packet #8
2012:01:13-13:02:22 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:22 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:24 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:25 tonick pptpd[21786]: GRE: accepting packet #9
2012:01:13-13:02:25 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:25 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:27 tonick pppd-pptp[21787]: sent [LCP ConfReq id=0x1        ]
2012:01:13-13:02:28 tonick pptpd[21786]: GRE: accepting packet #10
2012:01:13-13:02:28 tonick pppd-pptp[21787]: rcvd [LCP ConfReq id=0x1    ]
2012:01:13-13:02:28 tonick pppd-pptp[21787]: sent [LCP ConfAck id=0x1    ]
2012:01:13-13:02:30 tonick pppd-pptp[21787]: LCP: timeout sending Config-Requests
2012:01:13-13:02:30 tonick pppd-pptp[21787]: Connection terminated.
2012:01:13-13:02:30 tonick pppd-pptp[21787]: Modem hangup
2012:01:13-13:02:30 tonick pppd-pptp[21787]: Exit.
2012:01:13-13:02:30 tonick pptpd[21786]: 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
2012:01:13-13:02:30 tonick pptpd[21786]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
2012:01:13-13:02:30 tonick pptpd[21786]: CTRL: Reaping child PPP[21787]
2012:01:13-13:02:30 tonick pptpd[21786]: CTRL: Client 188.61.231.20 control connection finished
2012:01:13-13:02:30 tonick pptpd[21786]: CTRL: Exiting now
2012:01:13-13:02:30 tonick pptpd[9051]: MGR: Reaped child 21786

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