Hi Sai,
We've faced this problem after switching the users from Service to Dialog. I think our issue was that due to password policy, the password some of the dialog user haven't been changed for a long time and they weren't valid ( as per parameter login/password_max_idle_initial for example). So after changing the password it worked again. This is very ussual.
Regarding the notes, some of them are just informative and it don't depend on the SP level. Regarding the others, you can check the section "correction delivered in SP" in order to know if they apply.
Cheers,
Diego.