Hello all, I'm new to the forums and to ArcGIS but am having a similar problem where my user can no longer use Add Data>Add Data From ArcGIS Online. The window appears, he gets the header information, clicks Sign In and it crashes ArcMap. I'm not sure what is causing this but are using a proxy. One item I had a question about was the Connection settings and how it was formatted. This is what I see Since I'm new to the program, I don't know if this is an accepted format and from the text below the settings, am I to assume if you do not populate these fields it will default to the proxy settings in Internet Explorer? Do you need to enter "http=" for the address and can you separate with a semicolon. As a side note, my user can access the internet. I did all the tricks I could find such as unchecking 'automatically detect settings', a Reset on IE, made IE the default browser. As I'm trying to narrow down the list of suspects, the above image came up and would like to investigate it further or write if off, depending on the response.
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