telnet error

[tran vanle]

Hi all
I use kernel 2.6.11.7 and Ramdisk in ELDK 4.0 (I just use ,not rebuild Ramdisk). But when I telnet to this board ,i receive

telnetd: All network ports in use!

When I edit Ramdisk of ELDK 4.0 for login (use ttyCPM0) ,I receive the same
What cause this error ? kernel or ramdisk?
Thanks a lot    


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