Is port 8080 free? If you do
telnet localhost 8080
on the command file do you get an error?
Do you have some firewall in place that prevents binding 8080?

"Is port 8080 free?"

No, it is beeing used.

"Do you have some firewall in place that prevents binding 8080?"

No

"telnet localhost 8080 on the command file do you get an error?"

I will be able to test it only on monday when I will have access to my working 
machine. As soon as I try it I will post the result here.

"telnet localhost 8080 on the command file do you get an error?"

I get no error. The service that uses port 8080 is from Oracle XE. I will 
attach the PharoDebug.log

I am not sure if this is a problem with seaside or pharo itself.

You get the error because Oracle XE is running on 8080. Therefore 
Pharo/Seaside/Zinc can not bind 8080.

Either stop Oracle XE or make it run on a different port. You'll get the same 
error if you try to start Tomcat.

But it should prevent me to open the image and change the port number? If it 
cannot bind to 8080 I would expect it to open the image anyway, inform me of 
the error so that I could change the port. 


If I don't want to change the service I am running, my option is to change the 
port of the service, open image, change Zic port and than return the service to 
its original state. If I don't have permission to change the service (which is 
the case), how can I, on the same machine, change the port Seaside is using?

If I try to start tomcat I will get an error, indeed, but then I change the 
port tomcat runs without have to touch the running service, and start tomcat 
again.

So the image doesn't start at all and you get the stack trace in PharoDebug.log?

yes