Follow the below steps to change the Central Administration port number
- On the sharepoint server open the command line window and type cd C:Program FilesCommon FilesMicrosoft Sharedweb server extensions12BIN
- To find out the current central admin port no. type stsadm.exe -o getadminport
- To change the central admin port no type stsadm.exe -o setadminport -port <portnumber>
for example: if you want to set the admin port to 1499 type the command like
stsadm.exe -o setadminport -port 1499