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I've setup L2TP-VPN Settings in iPhone with iOS 4.2.1. But when I try to connect to the VPN server, I cannot connect And my phone shows the following error:

The L2TP-VPN server did not respond. try reconnecting. if the problem continues, verify your settings and contact your administrator.

How can I solve this problem ?

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I found an answer that solved this problem for me. The resolution was to change the encryption settings on the L2TP server. Check out: http://apple-ipad-tablet-help.blogspot.com/2010/12/ipad-vpn-fails-to-connect-on-ios-421.html

Note that the solution there may be specific to SonicWall firewalls used as VPN servers. Luckily for me, I use a SonicWall, so the solution worked perfectly for me. Your mileage may vary, but it's a good place to start.

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  • I realize this is an old answer, but unfortunately the link is dead.
    – WiredPrairie
    Commented Jan 19, 2016 at 1:11

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