[645] DUN could not complete a connection with the server...

• Access number is having a problem
• Dial-Up Networking Settings
• Password/Username is incorrect
• DNS#s are incorrect

Access number having a problem?

• Try a different access number, or if your *ISP has an 1800# try that, if you can connect you might want to inform your *ISP that you are having a problem, so they can get it fixed as soon as possible. If you are STILL getting the error, Try the following

Dial-Up Networking Settings:

1. Click on My Computer, Dial-Up Networking, Right-Click on your *ISP's connection, and select Properties
2.  Click on Server Types, MOST ISP's ONLY need the check mark in Enable Software Compression and TCP/IP if you have a check in Required Encrypted Password that could cause the error, might want to uncheck it, and try again, if not try the next

Password/Username is Incorrect:

1. Go to My Computer, Dial-Up Networking Open your ISP's Connection
2. Re-Enter the username, and the password. (If you do not know this, you might want to just call your ISP's Tech Support)
3. If you get connected Great! Make sure that you have the Check mark in Save Password! that way you won't have to enter it again (if you can't save it because it is grayed out, check out Grayed Password Box)

DNS#s are Incorrect: (Assuming you know the DNS#s, and if your ISP does not have it so the Server assigns the Name Server Addresses)

1. if you know your ISP's DNS#s, then here is how you put them in
2. Open, MY COMPUTER, Dial-Up Networking. Right click on your ISP's Connection, Select Properties
3. Click on Server Types (Tab/button)
4. Click on where it says TCP/IP Settings...
5. if there is not a Dot in "Specify Name Server Addresses" then click there
6. Double-Click (or just Highlight) the first Zero in the Primary DNS, and enter your ISP's DNS#s.
7. Click on OK, then OK and Try again