When connecting to an FTP server, a common error message is ’503 Login error’ or ‘invalid password’. This can be a simple yet frustrating message for what should be a simple login function.
If you’re having trouble getting past this error message, here are a few easy checks:
- Ensure password is typed as case-sensitive. Is your caps lock on?
- Verify user name and password is typed exactly (sorry, I know this one is obvious).
- Remove any spaces in user name and password — check if a space is secretly placed as a last character after the user name or password.

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