Error Opening folder! Error #21

Document ID : KB000027518
Last Modified Date : 14/02/2018
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Introduction: 

It is possible to see the error, Error Opening folder! Error #21 when trying to open a folder/repository from r11.5 Web Viewer. This is a different situation from the Error Opening folder! Error #6.

Question: 

What does the following error message mean when attempting to logon to the Output Management Web Viewer:

Error Opening folder! Error #21

Environment:  

Windows 2008/2012 Server R2

Answer: 

Error #21 means unknown error. Output Management Web Viewer has received an unknown error from DRAS. Examine the DRAS logs for possible causes. If the problem is not clear, contact Technical Support