You may receive error message 721 when VPN error, connect to internet ..., this page contains some useful information to repair your computer error code 721, if you fixed this error from this help article, you can email us (windowsxpregistrycleaner@gmail.com ) give your feedback, and we hope you can share this page to your friends if they need like you, thanks.

 

Error 721 PPP server

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• When you try to establish a multilink connection (using multiple ISDN channels) to a Livingston Portmaster using Windows NT 4.0 Dial-Up Networking, the second channel may fail to connect and display the following error:
  
  "Error 721 remote PPP server is not responding "
  
  Also, in some cases the connection may drop with no errors.
  
  However Windows 95 may connect both channels successfully.
   
• How to fix?
  
  This problem is caused by a limitation in certain versions of the firmware on the Livingston Portmaster, which do not allow simultaneous connections within 500 milliseconds of one another.
  
  The reason Windows 95 clients can connect to the Livingston Portmaster and Windows NT clients fail is because Windows NT 4.0 tries to connect both channels simultaneously. Windows 95 establishes the connection on the first channel then dials the second channel.
  
  To resolve this pc error, update the code on the Livingston Portmaster to the latest version, which can be found at Livingston's website:
  
  http://www.livingston.com
  
  Or contact Livingston Technical Support at 1-800-458-9966 or 510-426-0770.
   

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Microsoft help links for windows 721 error

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• You receive an "Error 721" error message when you try to establish a VPN connection through your Windows Server-based remote access server
   
• "Error 721," "Error 678," "Error 691," or "Error 777" error message when you try to establish a dial-up connection after you upgrade to Windows XP
   
• PPTP clients cannot connect to a PPTP server that has multiple IP addresses
   
• VPN Client Cannot Establish a Connection After You Install a Service Pack
   
• VPN Tunnels - GRE Protocol 47 Packet Description and Use
   
• Updated TCP/IP printing options for Windows NT 4.0 SP3 and later

 

• If you still haven't fixed the windows 721 problem:
  
  1. Please try the tool windows registry optimizer, it safely cleans PC errors & invalid entries cause slow speed, blue screen, deadlock errors and crashing, and repair registry problems to speedup your computer performances. It is easy to use. And you can scan your PC errors for free first!
  
  2. Some pc error is related to driver problems, Driver Update software is designed to quickly locate the most current drivers specific to your computer system, you can run a free scan for your pc driver update first.

 

That is we find the informations to fix your computer error 721 code problems, hope our page is helpful to you, if you still haven't fixed this errors, please contact microsoft support for further help.
 

 

www.pchealthadvisor.com

(Simple Steps:>>Download >>Install >>Free Scan >>Repair. that's all.)

 

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