There is a setting in a file called sqlnet.ora that can be changed that might help with the Credential Retreival Failed error that you are experiencing.
Change this line ...
Save the file and then try to run the IEexport.cmd again.
The sqlnet.ora file is somewhat difficult to find depending on the Oracle and Operating System versions.
It could be in a folder similar to this ...
Or in a folder similar to this.
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