First, make sure you are using Internet Explorer and not Microsoft Edge. ETO is only fully supported in Internet Explorer 11.
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Adding the HMIS Trusted Site to IE.

1. Open Internet Options through "Tools" 

2. Navigate to the second tab, "Security". Here you will click "Trusted Sites" then "Sites"

3. Add the trusted site below.
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​https://*.etosoftware.com  
​https://*.socialsolutions.com (Necessary for HMIS users)                
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4. Restart you Internet Explorer Browser to have trusted sites take affect.