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I've come across the abnormal situation, and can't understand what happens.

I am connecting databases using PL/SQL Developer 8.0.4.1514(I've also tried v7,but same) . Sometimes(When I am trying to log on, or when I open another session, or when I am trying to run query in previously opened session) this error message appears

enter image description here

Sometimes after 3 tries error resolves(using the same password on each try), sometimes it needs one try to resolve...

What may be the reason?

Thank you ...

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I suspect you're typing the password incorrectly ;) As an aside, what are you doing that requires you to connect as SYS ? –  Phil Mar 28 '12 at 10:28
    
@Phil thank you for your response. I will explain by example. I copied the password, pasted and tried to logon-> appeared error. Tried the next time by the same way -> again error, tried again by the same way(I mean pasted password) and logged on successfully. (Strange) –  kupa Mar 28 '12 at 10:37
    
This seems like an application issue. Have you contacted support for PL/SQL Developer? You could also download version 9 to see if the problem still exists there. –  Leigh Riffel Mar 28 '12 at 14:00
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@LeighRiffel I also think that this is PL/SQL Developer issue.. Now I created user with password expire and after connecting , there appeared as usual password changer window.. after trying to set new password(pressing OK) the same error happened. –  kupa Mar 28 '12 at 15:55
    
It's a version incompatibility issue. Try with a more recent version for Oracle 11g R2. –  user21081 Mar 10 '13 at 8:36
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