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what ports are used by pptp

Hi, i have several snap gear pptp server (vpn) boxes in diffrent companies that i have remote users connecting into.  the model is below.

http://www.cyberguard.com/products/firewall/SG_Family/SG300.html?lang=de_EN

lateley, some of the users using cable modems through adelphia (cable provider) have not been able to conenct to the pptp server on the device (the snapgear).  i was unable to resolve the issue until i moved the users to dsl, then all worked fine.  to aleviate the problem in the future i have decided to find out why.

question:  what ports does the pptp connection need/require?  maybee it depends on the security that i set from the begining, so i should have found out that and listed it here.

note, even on the cable users that cant connect to the more secure sites, i can connect to the above mentioned boxes that have lower security.  

-thanks, dan
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stevenlewis

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PPTP uses TCP Port 1723

Some routers have a specific option to allow PPTP or VPN traffic to pass, and you should use this instead of trying to open the ports manually.

Hope that helps!
oops- didnt see steven's post- must have showed up while I was typing.
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stevenlewis

LOL, NP conradie, happens all the time here :-)
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ok, StevenLewis is the winner, if i could milk this one a little bit more, are there ports used for the following encription types?  if you  dont awnser, ill still award you the victory, but if you could that would be great.

 PAP (basic authentication)
CHAP (strong authentication)
MSCHAPv2 (stronger authentication)
MSCHAPv2 and Encryption (recommended - stronger authentication plus

it seems when i lower it down from mschapv2 with encription to chap, it connects fine, and it seems to be just at the cable sites.  

thanks to you both....
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Not trying to be a smartass but have a peak
http://www.google.com/search?hl=en&q=pptp+port&btnG=Google+Search

Don't even have to click any of the links. The summaries google creates even give you the answer.
thanks guys, that helped.  

-dp
Thanks!