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I am trying to connect to a known VPN. Through a normal connection (i.e., wireless -> ISP) it works. However, via my 4G modem, I cannot connect. Error message is here

Apr  1 11:42:28 Dans-15 pppd[2546]: pppd 2.4.2 (Apple version 412.4) started by example, uid 501
Apr  1 11:42:28 Dans-15 pppd[2546]: PPTP connecting to server 'vpn.example.com' (vpn.example.com)...
Apr  1 11:42:29 Dans-15 pppd[2546]: PPTP connection established.
Apr  1 11:42:29 Dans-15 pppd[2546]: Connect: ppp0 <--> socket[34:17]
Apr  1 11:42:59 Dans-15 pppd[2546]: LCP: timeout sending Config-Requests
Apr  1 11:42:59 Dans-15 pppd[2546]: Connection terminated.
Apr  1 11:42:59 Dans-15 pppd[2546]: PPTP disconnecting...
Apr  1 11:42:59 Dans-15 pppd[2546]: PPTP disconnected

How can I examine the problem further? How can I find out more detail about the LCP: timeout?

Computer is running OSX 10.6.something. Same problem happens via iOS systems, too.

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2 Answers

up vote 1 down vote accepted

Your 4G provider likely blocks port 1723 (or possibly won't forward GRE packets for you) unless you purchase some sort of "business class" tier service.

Another thing I thought of is that your 4G connection probably uses PPP or PPPoE, and I don't know if you can use GRE with PPP.

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Hmmm... yeah, seems that way (community.vzw.com/t5/4G-Discussion/…)... so what happens if I get my VPN host to offer a different port? Might that help? THANKS for your answer, definitely helps. –  Yar Apr 2 '11 at 13:54
    
Could work. Hope VZ isn't sniffing your outgoing stream for GRE though. Don't have VZ so I can't verify. –  ultrasawblade Apr 3 '11 at 3:41
    
thanks, I've sort of gone a different route and exposed the in-VPN services I need to the Internet on a home computer :) –  Yar Apr 3 '11 at 15:32
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The real answer is: if you have the Samsung 4G hotspot from Verizon and must use a PPTP VPN, call Verizon and insist that they swap your hotspot for the Novatel.

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