You specify the port when ePO is installed, so if you chose 443, that's what the agents will try to use
It's possible to change the port - please see KB72936 for details - or if it's only a few machines or a recent installation you can uninstall & reinstall ePO, and choose a different port during the install.
thanks for your responce.
im wondering, if the port remain in use by another program, so agents fail to contact ePO on port 443, will they still use unsecure port or they wont contact ePO anymore until 443 port is free again for ePO?
When you customize the ports during the installation all agents deployed from the new ePO install will use the specified ports.
For example we use 9080 and 9443 as our custom ports and have left it at that, no need to change it back
i know i can change it. but my question is, if i dont change the default ports, and then some other program start using 443 port, will clients fall back on unsecure port (which is 8282 if i'm correct) or they will fail on contacting ePO server all together?
Another program will not be able to use 443. Once ePO is 'Listening' on 443 then normally the other program will get errors attempting to connect to the port saying it's already in use.
yes true but i installed PRTG on the same server and it occupied port 443 for its web interface and i saw on mcafee agents' log on clients that connection to ePO fail (it was a line highlighted in red). so now since mcafee has 443 as secure port and 8282 as unsecure port, logically it would switch to 8282 if 443 was not responding (or it wont and its hard coded to use 443 only)!