Error 691 is a network related error which may appear at the time you are attempting to establish a dial-up connection in Windows 7.

We had found that the error was appearing in the following circumstances:

1. Improper Dial-Up Connection Settings

2. Unconventional Network Settings in Registry

3. Incorrect User Name and Password

4. The Security Option of the Dial Up Connection is Improperly Set-Up

5. Verify the Phone Number

Improper Dial-Up Connection Settings

Make sure you had set-up the Dial-Up Connection properly. Do the below steps to resolve the error 691 in Windows 7, and re-establish the dial-up connection with valid settings:

1. Click Start button on the Taskbar.

2. Type Dial-up connection in the Search Box.

3. Press ENTER.

4. Right click your dial-up connection, and select Properties.

5. Click Options tab.

6. Make sure whether the checkbox Include Windows logon domain is checked or not. If it is checked, please make it unchecked.

7. Click OK button to confirm.

8. Click Dial button to test the results.

Unconventional Network Settings in Registry

In most cases we have seen yet, the network settings in the registry were unconventional or incorrect. The misleading information in the registry many times results in the error 691 in Windows 7 operating systems.

I would like to advise you scanning the registry for such problems and resolve them, and then establish a new dial-up connection. Please be aware while choosing a good registry cleaning software.

Incorrect User Name and Password

An incorrect user name and password supplied while making a dial-up connection results in error 691 in Windows 7. You shall recheck the User Name and Password by performing the steps below:

1. Click Start button on the Taskbar.

2. Type Dial-up connection in the Search Box.

3. Verify the User Name and Password from the Connect dialog.

4. Click Dial button to test the results.

The Security Option of the Dial-Up Connection is Improperly Set-Up

To resolve the error 691 in Windows 7, perform the below tasks:

1. Click Start button on the Taskbar.

2. Type Dial-up connection in the Search Box.

3. Press ENTER.

4. Right click your dial-up connection, and select Properties.

5. Click Security tab.

6. Mark the following box as checked up:

a. Allow unsecured password

b. Validate my identity as follows

7. Click OK button.

8. Click Dial button to test the results.

Verify the Phone Number

Entering a phone number which is not used at the time of establishing the connection may lead in error 691. Please verify that the phone number is correct.

Lower the Connection Speed

Lower the connection speed to resolve error 691 in Windows 7. Follow these steps:

1. Click Start button on the Taskbar.

2. Type View Network Connections.

3. Press ENTER.

4. Right click your connection, and then select Properties option.

5. Click General tab.

6. In the Connect using box, select your modem.

7. Set Maximum Speed (bps) to 9600.

8. Click OK button.

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