ERROR
Attempting to use the ArcGIS Solutions Deployment tool in ArcGIS Pro returns the error message:
Error: Failed to connect to source portal
Occasionally, the following error message is also returned:
Error: Failed to add <name of solution>
A proxy server or firewall is blocking the connection to ArcGIS Online.
To resolve the issue:
*.arcgis.com *.arcgisonline.com *.amazonaws.com *.virtualearth.net *.esri.com
Note: In some organizations, the IT team may also need to allow the domains in Step 4 on the organization's proxy server and/or firewall.
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