Unable to establish connection to https://portal.domain.com/arcgis

Question

I am unable to establish a connection to any Portal in ArcGIS Pro 2.4.2. We have also tested our Dev portal and www.arcgis.com with the same result. I am able to reach the Portal site in the browser fine and the TLS settings in the internet options have TLS 1.2 checked. What is very interesting is that when I have Fiddler running while opening ArcGIS Pro, it CAN connect to the Portal and I am able to sign in.

Any help is appreciated.

Thanks,

Bill

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AndresCastillo · Answer

excellent,

Thank you for sharing these trusted ArcGIS sites

Robert LeClair · Answer

Okay - another question - are you on VPN when attempting to log into AGP or use online services?  If so, this resolution from Support Services helped another customer.

- Navigate to Control Panel > Network and Internet > Internet Options > Security tab
- Select "Trusted Sites"
- Click "Sites"
- Add the following to to the list individually:

*.arcgis.com
*.arcgisonline.com
*.amazonaws.com
*.virtualearth.net 
*.esri.com
*.blob.core.windows.net

- Close trusted sites window
- Click OK to close Internet Properties

WilliamShoop · Answer

Good Afternoon,

This happened awhile ago, but from the notes I captured it was resolved. The issue was a bad proxy URL provided to our IT department. I am sorry this is not in my wheelhouse so I can't really speak to the details, but here is the response we recieved from IT:

This is now resolved. Network gave us the wrong URL for the proxy. I just put the new one in GPO now. Machines either need a GPupdate or a reboot to take effect. (will also happen naturally over time)

I hope this helps