fails to access embedded board using telnet

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http://www.linuxquestions.org – Hi all I am using a custom board with at91sam9260 micro controller. I could boot the board successfully with Linux Kernel 2.6.20(customized for our board). And able to 'ping' other devices from that. When I try to access the same board using telnet from other devices(I use telnet in linux/ putty in windows based machines) , its succeeding for 2-3 hours.But fails after that. We are able to access the board through hyper-terminal/minicom, which is connected to the board debug port. Problem is only with telnet connection. Is it a kernel bug ? Please help me out to solve this issue. Rega (HowTos)