Note
Although this update is still available, we suggest to use the new Dial-Up Networking 1.4 Upgrade instead.
In August 1998 Microsoft released a new version of Dial Up Networking (DUN) for Windows 98. In fact, it's a security update, that fixes several security issues with implementations of the Point-to-Point Tunneling Protocol (PPTP) used in Microsoft Virtual Private Networking (VPN) products.
Customers who are not using PPTP for network security are not affected by this issue.
Fixes
Download the patch from: ftp://ftp.microsoft.com/softlib/mslfiles/dun40.exe
Strong Encryption Versions (128-bit):
Customers in the United States and Canada can download the strong encryption versions of these updates from: http://mssecure.www.conxion.com/cgi-bin/ntitar.pl
Microsoft has published this Microsoft Knowledge Base (KB) article 189771 about the issue.
After you install Windows 98 Second Edition, the 128-bit data encryption won't work, and you will get this error message when you attempt to create a Dial-Up Networking (DUN) connection that uses 128-bit data encryption:
Error 629: You have been disconnected from the computer you dialed.
Double-click the connection to try again.
If you try to (re)install the 128-bit version of the Windows 98 Dial-Up Networking Security Upgrade (Msnt128.exe) file, you are unable to do so. When you double-click the Msnt128.exe file, you receive the 128 bit encryption for Dial-Up Networking (Not for Export) dialog box. When you click OK, you quit the Msnt128.exe program.
This is caused because Windows 98 Second Edition includes a newer version of the 40-bit DUN files that replace the 128-bit DUN files.
You can get a new 128-bit DUN Security Upgrade for Windows 98 Second Edition when Microsoft makes it available. To see if the 128-bit DUN Security Upgrade for Windows 98 Second Edition is available, view the following Microsoft Web site:
http://support.microsoft.com/Support/NTServer/128Eula.asp
Note that after accepting the License Agreement, the list of 128-bit software is available.
DUN 4.0