Problem upgrading C2960 IOS via TFTP

Question:

I got my new C2960 a couple Catalyst 3560 Price of days ago with an outdated IOS version (12.2) and i wanted to test the new IOS (15).

I know i can delete the current IOS version and download the new one from tftp server but i just want to test the new IOS without deleting anything yet. Once i like it, i will put it in the flash.

So, i created a tftp server, tested it,  and it worked fine. I even copied the running-config file from the flash to my computer using tftp server with no problems. So, tftp server and its connection are working fine.

Now, i tried

Switch(config)#boot system tftp://192.168.4.17/c2960-lanbasek9-mz.150-2.SE4.bin

This command should boot the switch using the IOS in the tftp server which resides in my computer (192.168.40.17) the next time i reload the switch. I saved my config and i rebooted the router.

This is what i got when reloading...

Loading "tftp://192.168.4.17/c2960-lanbasek9-mz.150-2.SE4.bin"...tftp://192.168.4.17/c2960-lanbasek9-mz.150-2.SE4.bin: no such device

Error loading "tftp://192.168.4.17/c2960-lanbasek9-mz.150-2.SE4.bin"

When i think of it, how can the switch access my computer's ip address during booting process? In booting process all the ports are showndown for failure testing purposes.

Am i using the wrong command to achieve what i want?

Answer:

TFTP boot don't work all the time.

Don't even bother trying Catalyst 3560V2 Price  to do this.