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cannot log in using server url 'https://test.salesforce.com/services/Soap/c/9.0'

I changed the server url from 'https://www.salesforce.com/services/Soap/u/9.0' to 'https://test.salesforce.com/services/Soap/c/9.0', and then trying to log in using my developer account.
And I keep getting the login error, says wrong password or account have been locked
I got the same error when using 'https://test.salesforce.com/services/Soap/u/9.0'.
But I could log in through 'https://www.salesforce.com/services/Soap/c/9.0' url.
I would like to know why I cannot log in. Do I need any special cert files?
Thank you!
developer edition accounts are not sandbox enabled. Test is the URL for sandbox.

If you have a developer account, login to www.salesforce.com.  If you have sandbox on one of your paying orgs, that is where you would use the test url