Does ArcGIS for Autocad 300 sp1 work with Portal for ArcGIS 10.7.1?

[TheodoreRakel]

I'm helping a client who has ArcGIS for Autocad 300 sp1 version 10.1.5001 setup in their environment.  They use this to access map services on from an ArcGIS Server version 10.2.1 successfully.  Now they have an instance of Portal for ArcGIS 10.7.1 setup and the map services have been published to it.  However, when they try to use ArcGIS for Autocad to access the map services from the 10.7.1 Portal, they get prompted repeatedly to supply their credentials in a Token Authentication window as shown below.  I tried supplying my credentials around 50 times before I gave up.  They don't get this when they access the 10.2.1 map services.  Should ArcGIS for Autocad 300 work when accessing a 10.7.1 Portal?

[TheodoreRakel · Accepted solution]

esri recommends upgrading to version 400.  version 300 does not work with portal authentication.