@Meisam, based on what I can see in the LDAP directory which is used to store developer account information my guess is that you actually set your password to something different than you think you did. LDAP shows the account being created 2018-10-06T10:09:15Z followed by 17 failed password attempts between 2018-10-06T10:09:29.872913Z and 2018-10-06T14:42:24.100338Z.

Because of T174469: LDAP account that is not attached on wikitech has no means for password reset I have attached the developer account to wikitech to make a password reset possible:

$ ssh labweb1001.wikimedia.org
$ mwscript extensions/OpenStackManager/maintenance/attachLdapUser.php --wiki=labswiki --user=Meisam --email={redacted}

Now that this has been done you should be able to go to https://wikitech.wikimedia.org/wiki/Special:PasswordReset, enter your username (Meisam) and email address, and submit the form to receive a password reset link by email that will allow you to set the password to a new value.

@bd808, Thanks for your helps. The problem is solved.
BTW, I use a password manager to keep track of these. Don’t know what went wrong there!