The Comodo Extended Validation Secure Server Certificate Authority (CA) SHA-1 version V3 certificate is not trusted by ArcGIS Online from version 3.8 onwards. This results in the inability of the token page to pass through the ArcGIS Online sharing proxy, returning the authentication prompt, "Unable to access authentication service."
Last Published: October 30, 2015ArcGIS for Server
Bug ID Number
July 20, 2015
August 21, 2020
ArcGIS for Server
Operating System Version
2012 64 Bit
This issue was not reproducible when tested by the development team. Issues may be given this status when they cannot be reproduced or are no longer relevant in a development version of the software, but a specific fix was not installed to address the issue. The issue's Additional Information section may contain further explanation.
This is fixed
Log in and access the REST page for the server before utilizing ArcGIS Online. This generates a token directly without passing the sharing proxy which can then be recognized in the short term by ArcGIS Online.