Error 734: The PPP Link Control Protocol Was Terminated
I'm trying to connect to my universties vpn which uses pptp, but everything i try comes up with Error 734: The PPP Link Control Protocol Was Terminated. Any suggestions.
October 31st, 2006 7:57pm

I get the same thing on Windows Vista build 6000 (Final). We can't get any machines to dial in at all! They all get Error 734: The PPP control protocol has terminated. Please someone give some advice.
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November 21st, 2006 12:14am

i am copy-pasting the solution fron microsoft article : To resolve this issue: 1.Click Start, point to Settings, and then click Network and Dial-up Connections.NOTE: For Windows Server 2003, click Start, point to Control Panel, and then point to Network Connections.2.Right-click the appropriate dial-up networking connection, and then click Properties.3.Click the Networking tab, and then click Settings.4.Click to clear the Negotiate multi-link for single link connections check box (if it is selected).5.Click OK, and then click OK.6.Double-click the connection, and then click Dial. If this procedure resolves the issue and you can establish a dial-up connection, you do not have to follow the remaining steps in this article.If this does not resolve the issue and you cannot establish a dial-up connection, go to step 7 to continue to troubleshoot this issue.7.Right-click the connection, and then click Properties.8.Click the Security tab.9.Under Security options, click Allow unsecured password in the Validate my identity as follows box, and then click OK.10.Double-click the connection, and then click Dial to verify that you can establish a dial-up connection.If u want to read it directly, go to:
December 14th, 2006 9:38pm

I have same problem when I use my new laptop with new windons Vista to dialup, it said "Error 734: The PPP Link Control Protocol Was Terminated" even I changedthe set on Allow unsecured password, unchecked Enable LCP extensions and Negotiate multi-link for single link connections, unckecked Include windows logon domain, unchecked require encryted password, no callback in DUNS setup. Could you please give me more suggestions to set dial-up connection (my old desktop with Windons 2000 works well).
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March 20th, 2007 7:41am

I am also trying to connect to my school's VPN and I get the same error. I've tried disabling/enabling a million different things in the VPN properties. Is there anything else I can do to try to get it to work?VPN was a cinch to setup and use with XP and I never had any problems. Is there an XP client out there so I can get VPN to work again without reverting to XP?
March 21st, 2007 5:11am

Folks, It would really help if one of you could provide me the following logs. This will help us investigate.. RAS Logs Execute the following from elevated command prompt netsh ras set tr * en (This enables RAS tracing) <recreate the issue> netsh ras set tr * di(This disables RAS tracing) This will generate log files in the %windir%\tracing directory. Please zip the files and send them to rrasblog@Microsoft.com. Please mention the error code and error string in the subject line thanks Aanand
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March 27th, 2007 11:56am

Please see the blog post at http://blogs.technet.com/rrasblog/archive/2007/04/08/troubleshooting-vista-vpn-problems.aspx for more information on the Windows Vista VPN issues and steps to resolve/troubleshoot them. Thanks, Janani
April 10th, 2007 11:36am

As suggested in the technet blog, I tried changing the default value of the allowweakcrpto variable to 1 for PPTP, in my system registry. The problem (VPN error 734) persists. Can anyone help?
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October 1st, 2007 3:24am

I did found a way out...under security, uncheck "require data encryption( disconnect if none")...that did it for me.
December 20th, 2007 3:56pm

modify the authentication protocol to "ppp authentication ms-chap ms-chap-v2"at cisco ios software
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April 17th, 2008 5:29am

Hi canz, How did you finally fix the problem?
November 9th, 2008 9:31am

Just got the same issue with Windows 7 Home Premium. Turning OFF CHAP and leaving MS-CHAP v2 enabled fixed it for me. Having both on together caused Error 734 every time.I hope that helps someone.Keith.
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October 25th, 2009 10:56pm

Thanks Keith, turning OFF CHAP and leaving CHAP v2 worked for me as well
January 5th, 2010 4:13pm

Having the same problem with Window7, trying to dial up and connect with an unsecured authentication. This is required by the connection ISP. Have tried almost every combination and all suggestions. Nothing works, still get 734 error. Works fine on Windows XP. If I could get the modem to work under Virtual XP I would use it. Have tried all avenues there. Finally got the networking working under Virtual Machine. Quite tricky.
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January 25th, 2010 9:14am

i am copy-pasting the solution fron microsoft article :To resolve this issue: 1. Click Start, point to Settings, and then click Network and Dial-up Connections.NOTE: For Windows Server 2003, click Start, point to Control Panel, and then point to Network Connections. 2. Right-click the appropriate dial-up networking connection, and then click Properties. 3. Click the Networking tab, and then click Settings. 4. Click to clear the Negotiate multi-link for single link connections check box (if it is selected). 5. Click OK, and then click OK. 6. Double-click the connection, and then click Dial. • If this procedure resolves the issue and you can establish a dial-up connection, you do not have to follow the remaining steps in this article. • If this does not resolve the issue and you cannot establish a dial-up connection, go to step 7 to continue to troubleshoot this issue. 7. Right-click the connection, and then click Properties. 8. Click the Security tab. 9. Under Security options, click Allow unsecured password in the Validate my identity as follows box, and then click OK. 10. Double-click the connection, and then click Dial to verify that you can establish a dial-up connection. If u want to read it directly, go to: Dear All,Any one can help, I also have problem with my vpn connection which uses pptp in window7. I cannot find the way to change security option to " Allow unsecured password" in window 7. Please advice who to do this in window 7.thanks in advance.Regards,Vannara
February 26th, 2010 4:44am

I have tried almost every tip on here and still can't get the VPN to connect. The one thing I haven't tried is the CHAP. I can't find it anywhere in my settings. I have adjusted everything on my router and my computer. The VPN works everywhere else except my home...and I work from home! If someone could add anything more I would really appreciate it. Thanks!
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March 11th, 2010 8:23pm

hey dude.. it worked for me too... thanks.. i was trying it for last 22 days.. i am using win 7 & i tried almost all options but atlast when i saw your post.. i tried it.. and now it works.. SOLUTION: 1. Turning off CHAP & leaving ie enabling MS-CHAP v2. NITIN
June 8th, 2010 1:39am

hey dude.. it worked for me too... thanks.. i was trying it for last 22 days.. i am using win 7 & i tried almost all options but atlast when i saw your post.. i tried it.. and now it works.. SOLUTION: 1. Turning off CHAP & leaving ie enabling MS-CHAP v2. NITIN Error 734: The PPP Link Control Protocol Was Terminated. For Windows Vista , 7: 1. Turning OFF CHAP and leaving MS-CHAP v2 enabled fixed it for me. 2. Having both on together caused Error 734 every time. For Windows XP,XP sp2,98, 2003 To resolve this issue: 1. Click Start, point to Settings, and then click Network and Dial-up Connections. NOTE: For Windows Server 2003, click Start, point to Control Panel, and then point to Network Connections. 2. Right-click the appropriate dial-up networking connection, and then click Properties. 3. Click the Networking tab, and then click Settings. 4. Click to clear the Negotiate multi-link for single link connections check box (if it is selected). 5. Click OK, and then click OK. 6. Double-click the connection, and then click Dial. • If this procedure resolves the issue and you can establish a dial-up connection, you do not have to follow the remaining steps in this article. • If this does not resolve the issue and you cannot establish a dial-up connection, go to step 7 to continue to troubleshoot this issue. 7. Right-click the connection, and then click Properties. 8. Click the Security tab. 9. Under Security options, click Allow unsecured password in the Validate my identity as follows box, and then click OK. 10. Double-click the connection, and then click Dial to verify that you can establish a dial-up connection. I hope that helps someone. Nitin Tripathi.
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June 8th, 2010 1:59am

I am using Windows 7 and facing the same problem. Can anybody let me know where can I find the setting option for CHAP and MS-CHAP in the system? -Bipin
August 20th, 2010 1:13pm

Hey People! I don't know about Windows 7 or Windows Vista but you can try it anyway! In Windows XP I was trying to connect to a VPN and I also came up with "Error 734: The PPP Link Control Protocol Was Terminated." I was really annoyed because I was once able to connect to this network. I tried all internet "solutions" and.. nothing... I thought: 1) Wrong Password 2) Application s blocking connection I did: 1) Try it in different computers.. it worked! Ok.. so we're facing issue no.2! 2) If you're using a router or modem-router: - go to the default access page: http://192.168.0.1 - Go to "services" tab or something like that - enable PPTP connections! Voilà... hope it works... atleast for a few ;)
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October 11th, 2010 2:53pm

Thanks Keith, it works.
October 17th, 2010 11:21am

I have the same problem with one customer. It gets that same error in windows 7 but the same machine has VMware running virtual XP and it connects just fine inside of xp, so that rules out environmental aspects. I've tried every possible combination of settings under properties and it does not work. It must be some sort of firewall / windows 7 issue. I'll post a reply if I resolve this myserty. BTW, it's a new installation of window 7 so reinstalling is out of the question.www.supertechteam.com
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November 11th, 2010 8:59pm

For those still using XP, here are settings that worked for me (I have Win XP Pro SP3): Under Networking: Type of VPN: Automatic Settings: clear "enable LCP extensions" and "negotiate multi-link..." Under Security: Security options: Advanced Settings: Data encryption: "optional encryption (connect even if no encryption)", Logon security: clear all except "unencrypted password" and "MS-CHAP v2" - Emz
December 25th, 2010 11:44pm

Maybe This Is Usefull For You People For WINDOWS 7 User Only :) http://www.windowsnetworking.com/articles_tutorials/Windows-7-Understanding-Network-Administration-Configuration.html
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March 15th, 2011 11:25pm

Error 734: The PPP Link Control Protocol Was Terminated
May 14th, 2011 4:58am

I had the same problem logging into a Cisco VPN, but then played around with it... I have it working now. Here's what I did: Under the Options Tab Uncheck the "Include Windows Logon Domain" Under the Security Tab 1. I switched from the VPN type to: PPTP 2. I switched the data encryption to: Optional encryption 3. I changed the "Allow these protocols" to just: CHAP (Challenge Handshake Authentication Protocol)
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May 19th, 2011 10:47pm

I was getting error 734 with windows 7 dial up networking. I finally found this article http://blogs.technet.com/b/rrasblog/archive/2007/04/08/troubleshooting-vista-vpn-problems.aspx that notes MS-CHAPv1 support has been removed from Vista and Win7. After using XP with only 1 authentication protocol enabled at a time to test dial-up, I found that my dial-up server was only allowing MS-CHAPv1 and hence Vista and Win7 cannot connect. When I try to use MS-CHAPv2 I get error 734. If I tried PAP or CHAP, I got error 691 since those were disabled in the dial-up server.
May 25th, 2011 10:31pm

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