Error opening tftp255.255.255.255network config Error Message Prevention

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008020b19e.shtml

Solution

To disable this feature, enter the no service config global command.

Router#config terminal
Enter configuration commands, one per line.  

Router(config)#no service config

Router(config)#exit

Router#copy running-config startup-config

At the next bootup of the router, the error messages should no longer appear.