Unable to install ArcGIS Web Adaptor (SII)

[YiQiang]

Tried 10.1 and 10.2, the same issue:

My OS is Windows Server 2012. ArcGIS for Server has been well installed. When I proceed to install Web Adaptor, it comes the
error:

"Error 2878. On the dialog WebSite List the control ListBox1 has a possible value: xxx, 80, 2. This is an invalid or duplicate value." where xxx is a HTTP website on this server.

Checked posts about this issues, I got two suggestions:
1) Change the binding of the existing site to a different number, say 8080. However, the number in the error changes as well, to 8080. I've also tried to stop the existing site or delete the entire banding. But nothing works.

2) Install from command line. I've got another error:
"Error 1606. Could not access network location \arcgis"
When I change the parameter VDIRNAME to something else, the error remains and the directory in the error changes too.

Anyone can help me on this?

[NidhinKarthikeyan]

Try Command-line installation option.

[BubbaHey]

Try the following:

1. remove all bindings

2. add binding, for example,  port http port 80

3. leave host name blank

4. reinstall web adaptor

[YiQiang]

Try the following:

1. remove all bindings

2. add binding, for example,  port http port 80

3. leave host name blank

4. reinstall web adaptor

Thanks. It works with the windows installation, although the command line option still does not work.
What I did was:
1) removed a binding to the localhost.
2) changed the port of the binding to the existing site to 8080. (I couldn't remove this binding)
3) add a new binding with port 80, empty host name.
4) execute the installation in the windows. (I tried command installation first, but not work)

[nicogis]

you don't need remove bindings..

Run the installation in command line:

example:  <path to ArcGIS Web Adaptor (IIS) setup download>\setup.exe /qb ADDLOCAL=ALL VDIRNAME=nameofArcGISWebAdaptorwebapplication WEBSITE_ID=1

The WEBSITE_ID parameter is used to specify the website where the Web Adaptor web application will be created. The value for WEBSITE_ID is a number specific to each website on your server and assigned by IIS. The IDs for the websites on your server can be found in IIS Manager. The default website has a website ID of 1. This command line parameter is required when multiple websites exist. By default, the WEBSITE_ID parameter is set to the default website (even if multiple websites exist). The parameter WEBSITE_ID is case sensitive.

for details on parameters: http://resources.arcgis.com/en/help/install-guides/arcgis-server-web-adaptor-iis/10.1/index.html#/In...