Revolving around the core of technology
Jemail,
There are two possible reasons for this:
Imran
Are you using any VNC programs? I believe they use port 5800 as well.
Since you can't connect to the Admin console to adjust the listening port through the GUI, you will probably have to go through the xml files to change it.
C:\Syncrify\config\AppConfig.xml is the location by default of the file that controls which ports the web server is listening on. There is a line in there for "httpPort2" that should have 5800 in it. You can change that to another port and then restart the Syncrify Server service. You should then be able to connect to the admin console on your newly designated port at that time.
I AM IN NO WAY AFFILIATED WITH SYNAMETRICS SUPPORT. I AM POSTING MY PERSONAL OPINION AND SUGGESTIONS AND TAKE NO RESPONSIBILITY NOR ASSUME ANY LIABILITY FOR THE RESULTS OF SUCH SUGGESTIONS, SHOULD YOU CHOOSE TO PUT THEM INTO PRACTICE. USE AT YOUR OWN RISK.