Add Extension - No response

Question

ArcGIS Server:  10.1
Description:  Logged on as ArcGIS Server admin and then tried to add (SOE) extensions in ArcGIS Server Manager in the production server's.
Problem:  After clicking the 'Add Extension' button and then loading the soe file from C:\...\, Clicked the 'Add' button.  Then I got IE warning message (see the image) [ATTACH=CONFIG]31836[/ATTACH].  The message shows the blocked site is about:blank, but actually it is http://localhost that is in the list of my IE's Trusted site zones.
Question:  What security setting should be done to eliminate the blocking?
Thanks if you can help.

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ShaningYu · Accepted Answer

1) In IE, go through menu, Tools > Internet Options.
2) Click Security tab and then highlight on the Trust Sites.
3) Click the Sites button to open the Trusted Sites wizard.
4) Add about:blank.
5) Click Close button and then OK button to complete.
After the setting, soe file can be added.