Oracle.ManagedDataAccess and ORA-01017: invalid username/password; logon denied

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I have been struggling with this same issue for a couple of weeks and finally have a resolution. I had to disable the FIPS security policy, try setting this key:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy]
“Enabled”=dword:00000000

to zero, it worked perfectly for me

I was following your thread your blank password issue eventually pointed me here:

https://community.oracle.com/thread/2557592?start=30&tstart=0

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