"Unable to configure the Portal with the Web Adaptor. Please make sure that the Portal and WebAdaptor are of the same version."

[CassandraFollett]

Get this opaque error when trying to register Portal and the GIS Server with the Web Adaptor on Red Hat Linux. All are 10.5.1; two versions of Web Adaptor with Tomcat (unique names). Any other diagnostics I can try? 

[JonathanQuinn]

Did you have a previous version on the machine?  If so, did you undeploy and de-deploy the WAR file?

[CassandraFollett]

No previous version; this is a fresh install of all three components. Initially also I tried to only do the single Web Adaptor deployment... that failed with Portal so I tested with GIS Server. 

[JohnBrockwell]

What is the WAR file?