Unable to add secured on-premise ArcGIS Server Map service to Web Map

[DirkVandervoort]

I host ArcGIS Server 10.0 SP5 with token secured map services.

When creating a web map, using Add->Add Layer From Web, then entering a URL of my rest endpoint with the "Add ArcGIS Web Service" option. ArcGIS Online recognizes the it's a secured service and queries for username and password. Entering u/p, then ArcGIS Online informs me that:

Unable to access the authentication service.

Both my secured map service and my token service are exposed to the internet.

My map service URL is

• https://www.MyDomain.com/ArcGIS/rest/services/MyMapService/MapServer

My token service is:

• https://www.MyDomain.com/ArcGIS/tokens/getToken.html

Similarly, in ArcGIS Online: Home->My Content->Add Item, On the Web->ArcGIS Web Service-> enter the URL and enter the credentials, I get informed that either Unable to load https://MyArcGISAccount.maps.arcgis.com/sharing/proxy?https://www.MyDomain.com/ArcGIS/tokens status: 0 or Valid service credentials not fully specified.

Bottom line is that our organization cannot use ArcGIS online or that I cannot recommend its use to our organization. Unless we can resolve this issue and it does not involve upgrading to ArcGIS 10.1 or 10.2.

Can anyone help me out with this please. TIA

[joshjones]

I am experiencing the same issue on a secured arcgis server service running 10.2.1  I can access the rest services using this password but when trying to store credentials I get the message "Valid service credentials not fully specified."  I have no idea what else to try.  A little help here esri?

[CarlosKrefft]

Same issue here. I can't add any secure services.
"Valid service credentials not fully specified"

I'm using 10.2.2 web adaptor, 10.2.2 arcgis server, and 10.2.2 portal.