VPN not working

I'm trying to setup a client to server vpn with a draytek router, all ports and port redisrection for pptp are enabled and the connection is getting as far as the router but will not authenticate the below text is what is in the syslog

 141¬ 2015-06-25 19:14:39¬ Jun 25 18:14:14¬ Vigor¬ PPTP (VPN-0) ==> Protocol:LCP(c021) ConfRej Identifier:0x01 Protocol Field Compression Address/Control Field Compression Call Back: 06 ##¬

I've tried drayteks client vpn app and windows app to no avail

any help much appreciated
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Blake LongEngineerCommented:
Have you double checked that you are using the proper credentials in your client app?
techsolve1Author Commented:
Rob WilliamsCommented:
PPTP connections are a two step process, if you are getting a connection using PPTP, which you can test with
  telnet  1723
but authentication fails it is likely from blocked GRE.  GRE is protocol 47, not port 47 and thus cannot be forwarded but all routers have a way to allow GRE traffic.  I am not familiar with the Draytek, but with some, forwarding PPTP traffic, not forwarding 1723 does it, others you select "allow PPTP pass-through", and still others have specific commands.

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techsolve1Author Commented:
Thanks for the feedback, it seems configuration was fine, the problem lies with mobile broadband providers and certain mobile operators which are blocking particular VPN traffic in our area, they coundlnt give a valid reason for it, so just used one that allows VPN traffic, problem fixed
techsolve1Author Commented:
Thanks Rob for comment handy to know
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