Change the Central Administration Web site port number

Use this procedure to change the port number of the Central Administration Web site.

Change the Central Administration Web site port number by using the Stsadm command-line tool

1. On the drive where SharePoint Products and Technologies is installed, open a command-line window and type the following command:

   cd %CommonProgramFiles%Microsoft SharedWeb Server Extensions12bin

2. To determine the current port number for the Central Administration Web site, at the command prompt, type the following command, and then press ENTER:

   stsadm -o getadminport

   For more information, see Getadminport.

3. To change the port number for the Central Administration Web site, use the following command, including any options that apply to your environment:

   stsadm -o setadminport -port  [-ssl] [-admapcreatenew] [-admapidname] 

   For more information, see Setadminport.

Note: You can only change the port number for the Central Administration Web site by using the Stsadm command-line tool.

via Microsoft Technet