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Error
645 Discussion Board If the fixes below didn't work... Post your
problem / solution here!!
Error 645 from Microsoft Dial Up Networking "Internal Authentication Error"
Google News Information Error 645
Microsoft Support Page Error 645 
SYMPTOMS When you attempt to establish a connection with Dial-Up Networking (DUN), you may receive the following error message: Error 645 - Dial-Up Networking could not complete the connection to the server.
This behavior can occur if the Require encrypted password option is enabled on the Server Types tab in the connection's properties. RESOLUTION To resolve this behavior: 1. Click Start, point to Programs, point to Accessories, point to Communications, and then click Dial-Up Networking. 2. Right-click the icon for your connection, and then click Properties. 3. Click the Server Types tab, click to clear the Require encrypted password check box, and then click OK. 4. Enable Software Compression and TCP/IP should be the only two property boxes check marked.
What's A Modem Init String? Try adding modem init string ATZ. This seems to work with many laptop computers. How To Add a Modem Init String
Try moving modem card to another PCMCIA card socket.
Remove and reinstall the Dial-Up Adapter and Dial-Up Networking. To do so, use the following steps: 1. Click Start, point to Settings, and then click Control Panel. 2. Double-click Network. 3. Click Dial-Up Adapter, and then click Remove.  4. Click OK. 5. When you are prompted to restart your computer, click No. 6. Double-click Add/Remove Programs. 7. On the Windows Setup tab, click Communications, and then click Details. 8. Click the Dial-Up Networking check box to clear it. 9. Click OK until you return to Windows. 10. Close Control Panel, and then restart the computer. 11. Go to My Computer, Dial Up Networking, and try to reconnect.
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