We can configure your Database Server Manager to its default setting to get this fixed. Let me guide you through the steps.
Also, make sure you've set your firewall permission. Please refer to this article for the steps: Configure firewall security settings for Desktop.
Once done, try to log in again.
If it doesn't work, please perform the following:
You might also want to check this handy article for future reference: Account management.
Let us know if you have additional questions. We're here to help.