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Since you are uinsg https with port 443 on the web adaptor, I'm assuming you have setup the GIS Server to also use the https protocol. If not, you need to. For more information see this documentation:
http://resources.arcgis.com/en/help/main/10.2/index.html#/Enabling_SSL_using_the_default_self_signed...
If you have setup the protocol on the GIS Server to "http and https"... your URLs to connect to Manager through the GIS Server should look something like this:
https://yourservername:6443/arcgis/manager/
or
http://yoursevername:6080/arcgis/manager
Do you get the 403 forbidden error at both of these URLs?
Are you logging into the GIS Server (http://server:6080/arcgis) or the web adaptor (http://server/arcigs)?
Can you log into the ArcGIS Server Manager from a browser on your PC? If so, are you able to log in with your credentials or using the primary site admin account?
Is your GIS Server set to use the GIS Tier or Web Tier for auththentication? If its set to use the Web Tier, is the web adaptor server's IIS site set to use Anonymous or Windows authentication? Also....is the web adaptor's IIS site using a standard port like 80...or something different?
Since you are uinsg https with port 443 on the web adaptor, I'm assuming you have setup the GIS Server to also use the https protocol. If not, you need to. For more information see this documentation:
http://resources.arcgis.com/en/help/main/10.2/index.html#/Enabling_SSL_using_the_default_self_signed...
If you have setup the protocol on the GIS Server to "http and https"... your URLs to connect to Manager through the GIS Server should look something like this:
https://yourservername:6443/arcgis/manager/
or
http://yoursevername:6080/arcgis/manager
Do you get the 403 forbidden error at both of these URLs?