PRB: Cannot Connect with Dial-Up Networking from SBS Client

ID: Q196267

The information in this article applies to:
  • Microsoft BackOffice Small Business Server versions 4.0, 4.0a, 4.5
  • Microsoft Windows 95
  • Microsoft Windows 98
  • Microsoft Windows NT Workstation version 4.0
  • Microsoft Windows 2000 Professional

SYMPTOMS

A dial-Up Networking connection can be made from a Small Business Server (SBS) client computer to a dial-up IP network.

The SBS client computer gets an IP address from the Dial-Up Server and it is correct when viewed with Winipcfg.exe.

User can not browse the Internet or send/receive POP3/SMTP mail.

PINGing the external destinations can fail as well as the NSLOOKUP, FTP, TELNET commands.

A Network Monitor trace will show traffic being sent to SBS/Proxy Server.


CAUSE

The WinSock Proxy Client is installed and enabled on the SBS client computer.


RESOLUTION

On SBS client computers, it is normal for the WinSock Proxy Client (WSP Client tool in the Control Panel) to be installed and enabled by default. This is to allow for the SBS client computers to use the SBS server as a proxy to the Internet.

To allow for IP traffic to use a dial-up networking session from an SBS client computer, the WSP Client must be disabled for the duration of the dial-up networking session.

To Disable the WSP Client



  1. Click Start, click Settings, and then click Control Panel.


  2. In Control Panel, double-click WSP Client.


  3. Click to clear the "Enable WinSock Proxy Client" check box.


  4. Click OK


  5. Restart your computer when prompted


NOTE: It is not necessary to restart the client computer after disabling the WSP Client unless there is an active WinSock session.

To re-establish Internet connectivity through the SBS server, follow the above steps, only enable the WinSock Proxy Client.

All CERN compatible applications like Internet Explorer should be configured NOT to use Proxy Server.

To do so in Internet Explorer, on the View menu, click Internet Options. Click the Connections tab and click to clear the "Access the Internet using a proxy server" check box.


STATUS

This behavior is by design.


MORE INFORMATION

The WSP Client intercepts sockets-based IP traffic and redirects this traffic to a Proxy server. If active while a dial-up networking session is created, the WSP Client will redirect most IP traffic that should go through the dial-up networking connection to go, instead, to the Proxy server.

Additional query words: dun smallbiz

Keywords : SBS
Version : WINDOWS:2000,95; winnt:4.0,4.0a,4.5
Platform : WINDOWS winnt
Issue type : kbprb


Last Reviewed: January 21, 2000
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