When trying to renewing SSL certificate

[ChrisPAR]

This is causing you the issue, I’m afraid.
The client area is where you’re meant to be logging in from - the dashboard: https://dash.infinityfree.com

When you change your hosting account’s password from the control panel directly, the new password isn’t updated in the client area, which results in its tools (like the free SSL certificate one) still attempting to use your old credentials, and failing to login as a result.

You’ll need to synchronize the records by changing your hosting account’s password through the client area:

@Admin

Change your account password

Sometimes, the hosting account password is not properly synchronized across all services. To fix this, you can change the password of your hosting account, which should force the new password to be set correctly everywhere.

To change your hosting account password, login to the client area, go to the Accounts list and click Manage next to the account. Then, click the Edit Account button and scroll down to the Hosting Account Password panel, and update your password there.