Web Adapter on Linux / Tomcat questions

[CassandraFollett]

I deployed my web adaptor on Tomcat on a Red Hat host. 

When I access through "host.domainname.com:8080/arcgis/webadaptor", I get the following popup.

"The web adaptor must be installed on a web site running on port 80 before it can be configured with Portal for ArcGIS. Please reinstall the Web Adaptor on a web site running on port 80. For instructions, see installing the ArcGIS Web Adaptor."

The linked guide only speaks to IIS.

I assume that I need to link Tomcat to Apache httpd or similar and then access the web app through http://host.domain.com/arcgis/webadaptor" rather than appending port 8080. Am I on the right track with this thinking, and if so, has anyone run through this configuration themselves and have any advice? 

- Cassie 

[JonathanQuinn]

The web adaptor can only run on 80 and 443:

About the ArcGIS Web Adaptor—Portal for ArcGIS (10.5.x) | ArcGIS Enterprise 

Note:

You can only use the Web Adaptor with port 80 or 443. Using different ports is not supported.

I assume you don't have root access to set Tomcat to run on 80 and 443?