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PPTP and L2TP VPN connections from MAC or iOS clients prevent other VPN connections

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All Forums >> [ISA 2006 Firewall] >> VPN >> PPTP and L2TP VPN connections from MAC or iOS clients prevent other VPN connections Page: [1]
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PPTP and L2TP VPN connections from MAC or iOS clients p... - 24.Aug.2012 5:56:37 PM   
jamhol

 

Posts: 1
Joined: 24.Aug.2012
Status: offline
We have a situation that just started early this week.  If a VPN connection is initiated by a MAC or iOS clinet machine using either PPTP or L2TP, it prevents other VPN connections from occurring.  There are not any helpful logs in the event log or ISA server logs. 

One interesting note is that any pre-existing VPN sessions from Windows clients are not affected.  It just prevents any new VPN connections.  The client side times out during authentication - DUN error 681.  We have had successful VPN connections from MAC and iOS clients previously. 

There were some Windows Updates applied over the last weekend, but we removed those as a troubleshooting step. 

Has anyone seen this or have any ideas on how to continue troubleshooting?

ISA Environment:
Windows Server 2003 R2 SP2 x64
ISA 2006 Version: 5.0.5723.514
Using Active Directory for authentication (no RADIUS)

< Message edited by jamhol -- 24.Aug.2012 6:01:36 PM >
Post #: 1
RE: PPTP and L2TP VPN connections from MAC or iOS clien... - 5.Oct.2012 12:36:16 AM   
alanwade

 

Posts: 1
Joined: 5.Oct.2012
Status: offline
L2PT protocol offers fabulous online security plus IPsec. It uses two means authentication procedure requiring computer-level authentication wherever digital certificates and alternative relevant info for initiating the IPSec session. Then, user-level authentication is additionally required requiring surgical procedure protocol for L2TP VPN tunnel.

(in reply to jamhol)
Post #: 2

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