i can not start the derby database?

i try to connect to the derby and shows me the following..Could not listen on port 1527 on host localhost.why all the time shows me this ?
[166 byte] By [pinantonios] at [2007-11-26 7:06:44]
# 1
did you start it?
IvanSidorkin at 2007-7-6 15:54:12 > top of Java-index,Development Tools,Java Tools...
# 2
Most likely the port 1527 is already occupied on your machine. Please check whether this is true. If it is - terminate the application which occupies it and then try starting/connecting to Derby again.
KSorokin at 2007-7-6 15:54:12 > top of Java-index,Development Tools,Java Tools...
# 3
Another issue can be a firewall application not allowing the database to listen on that port. If you have any firewall applications turned on, try turning them off temporarily and if this helps - set them up, so that they do not interfere with Derby's activities.
KSorokin at 2007-7-6 15:54:12 > top of Java-index,Development Tools,Java Tools...