Microsoft Vpn Error 768
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Forums >> [ISA Server 2004 Firewall] >> VPN >> Error 768: While trying to connect via L2TP Page: [1] computer error codes troubleshooting Login Message << Older Topic Newer Topic >> Error 768: While trying to connect via L2TP - 11.Mar.2005 7:34:00 PM rhassall Posts: 5 Joined: 3.Mar.2004 From: VA Status: offline The
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setup is ISA 2004 on a Server 2003 box. We are able to connect with PPTP with no issues. But, when we try via L2TP we receive the Error 768: The connection attempt failed because of failure to encrypt data. Then I uncheck the option of "Require data encryption" on the Security tab in the VPN Connection Properties and receive Error: 789 The L2TP failed to dial up error 1 connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer. Any assistance would be great! Post #: 1 Featured Links* RE: Error 768: While trying to connect via L2TP - 13.Mar.2005 5:43:00 PM tshinder Posts: 50013 Joined: 10.Jan.2001 From: Texas Status: offline Hi R,Are you using certificates or pre-shared keys for the L2TP/IPSec connection?Thanks!Tom (in reply to rhassall) Post #: 2 RE: Error 768: While trying to connect via L2TP - 14.Mar.2005 1:03:00 PM rhassall Posts: 5 Joined: 3.Mar.2004 From: VA Status: offline We have tried both a Microsoft generated certificate and a pre-shared key with the same results, no connection. (in reply to rhassall) Post #: 3 RE: Error 768: While trying to connect via L2TP - 15.Mar.2005 12:40:00 PM tshinder Posts: 50013 Joined: 10.Jan.2001 From: Texas Status: offline Hi R,Make sure that you're using ONLY either a pre-shared key *or* cert. Not both.HTH,Tom (in reply to rhassall) Post #: 4 RE: Error 768: While trying to connect via L2TP - 15.Mar.2005 1:16:00 PM rhassall Posts: 5 Joined: 3.Mar.2004 From: VA Status: offline
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User Posts: 1 L2TP VPN connection error 768 Hi I'm using L2tp/IPSEC for my vpn clients. Most clients are using Windows XP, except for one who is using Windows 2000 sp4. When he try to connect he receives this error : Error 768: the connection attempt failed because of failure to encrypt data. I checked his setting and everythings seems to be fine, he has valids and good certificates installed, user name and password are good. I got the same error with one windows xp and made this commands to resolve the issue netsh winsock reset The RAS server is a Windows 2003 sp1 server and I'm using a ISA 2004 server. Those two are behind a NAT device (Cisco pix) any idea thanks sponsored links 2 24th February 02:27 v-xuwen@online.microsoft.com (vincent xu External User Posts: 1 L2TP VPN connection error 768 Hi, From the description, I understand that you are building an IPSEC/L2TP VPN connection on the ISA Server 2004. One windows 2000 client has problem in establishing the VPN connection Based on my research, since the problem only occurs on a specific client, the problem could be probably related to the client OS. To isolate the issue, please help to gather the following information: 1. Are all the clients located in the same place when establishing the VPN connection to the ISA Server? Are the problematic workstations located behind any firewall? 2. Have you configured both your ISA Server and hardware router to allow UDP port 500 and 4500? 3. Please try disabling the Windows Firewall on the 2000 client. Please also make sure the firewall client is not enabled on the windows 2000 . 4. Please disable any AV software on the 2000 client, and then perform a Clean Boot on the problematic workstation. A Clean Boot will allow us to isolate any device drivers or programs that are loading at startup that may be causing a conflict with other device drivers or programs that are installed in your computer. A. Click Start, click Run, type "msconfig" (without the quotation marks) and click OK. B. Select "Selective Startup" and remove the check box for "Load Startup Items". C. On the "Services" tab, click Enable All. D. Check "Hide all Microsoft Services", click Disable All and clear "Hide all Microsoft Services". E. Click the OK button and then Click Yes to restart your computer. Note: Please copy msconfig.e