AlaskaAir.com

• 12/5/15 – The sign-in information entered does not match our records. Please try again.

Amazon.com

• 12/2/15 – There was a problem with your request
  There was an error with your E-Mail/ Password combination. Please try again.

American Airlines (AA.com)

• 12/5/15 – We’re sorry
  We couldn’t log you in with the information you entered. For your security, your account will be locked after 6 unsuccessful attempts.
• 12/5/15 – Something went wrong
  Please check your login information and try again.

Answers.com

• 12/2/15 Username Does Not Exist
• 12/2/15 Password Mismatch

Buzzfeed.com

• 12/2/15 – Please provide a valid username and password.

Delta.com

• 12/5/15 – The information you’ve entered is not valid. You have a limited number of login attempts before your account will be temporarily locked. Please try again or use LOGIN HELP.

Dropbox.com

• 12/5/15 – Invalid email or password

Ebay.com

• 12/2/15 – Oops, that’s not a match.

Facebook.com

• 12/2/15 – Please re-enter your password
  The password you’ve entered is incorrect. Forgot Password?
  Forgot your password? Request a new one.

Frontier Airlines (flyfrontier.com)

• 12/5/15 – Sorry! You entered an email address, Early Returns account number or password that may be incorrect. Please check your details and try again.

Google Apps

• 5/20/14 – The email or password you entered is incorrect.

JetBlue.com

• 12/5/15 – Oops!
  Your email and/or password were entered incorrectly.
• 12/5/15 – Either the email address or password was not found. Please try again.

Microsoft

• 12/2/15 – That Microsoft account doesn’t exist. Enter a different account or get a new one.
• 12/2/15 – That password is incorrect. Be sure you’re using the password for your Microsoft account.

Netflix.com

• 5/20/14 – The login information you entered does not match an account in our records. Remember, your email address is not case-sensitive, but passwords are.
• 12/2/15 – The login information you entered does not match an account in our records. Remember, your password is case-sensitive.

Pinterest.com

• 12/5/15 – The email you entered does not belong to any account.
• 12/5/15 – The password you entered is incorrect.

Southwest.com

• 12/5/15 – The Username/Account Number and/or Password are incorrect.

Spirit.com

• 12/5/15 – Invalid email address or incorrect password,
  Please correct and re-try or select Sign Up.

TeamViewer

• Version 9 – The username and password you entered do not match any accounts on record.

Twitter.com

• 12/2/15 – The username and password do not match.

United.com

• 12/5/15 – The MileagePlus number or PIN/password entered does not match our records.  Or you have used a username or e-mail address.  Sign-in using username or email is currently unavailable. Please try again using your MileagePlus number. If you have forgotten your information, please use one of the links below for help.

VirginAmerica.com

• 12/5/15 – OOPS. THE PASSWORD OR THE USER ID ISN’T CORRECT. PLEASE CHECK AND TRY AGAIN.
  #2713661

WordPress self-hosted

• Version 4.3.1 – ERROR: Invalid username.
• Version 4.3.1 – ERROR: The password you entered for the username [username] is incorrect.

WordPress.com

• 5/20/14 – ERROR: Incorrect username or password.
• 5/20/14 – ERROR: Too many failed login attempts. Please try again in 20 minutes.
• 12/2/15 – ERROR: Incorrect username or password.
• 12/2/15 – ERROR: The password you entered for the email or username [username] is incorrect.
• 12/2/15 – You have exceeded the login limit. Please wait a few minutes and try again.

Yelp.com

• 12/2/15 – The email address or password you entered is incorrect.