Next you can find some steps to solve the issue. Follow them step by step in the order they're indicated.
After each step try to connect with Isabel 6.
Once the problem is solved, you do not need to proceed with the subsequent steps.
Check the LAN settings:
Verify if the websites of Isabel 6 and/or eGovernment websites are available in your list of Trusted Sites.
Make sure you have installed the latest security patches in Windows and verify the following settings in Internet Explorer:
If you see that the changes to these options are not taken into account or if you cannot modify these settings, please contact your System Administrator.
Verify the Internet Options > Connections > LAN settings. Copy all available information since this is required to connect to the internet.
After the reset of your browser, if you have copied some settings at the beginning of the procedure, you can now go back to LAN settings to restore them.
Verify if 'Automatically detect settings' is disabled.
Remove all of your Isabel certifcates:
Start Isabel 6 and try to login.
Start the login to Isabel 6 with run as administrator.
To do this, right-click on the Isabel 6 login icon from your start menu or desktop and select "Run as Administrator".
If this works, this indicates that your normal windows user rights are not sufficient to run Isabel 6. Please contact your IT support to correct these limitations in the security or policy configurations.
If the issue is not solved after performing all previous steps, contact Isabel Customer Care.