krb5kdc and kadmind can't work

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Hello all!

I'm using krb5-1.4-signed.tar on REDHAT advance server 2.1.Everything seems ok,and it does work about six months well.
A few days ago ,for some reason ,i stopped them and  when i tried to start them again, i kept getting the following error message on the log file:
/var/log/krb5kdc.log
krb5kdc: Generic unknown RC/IO error - while initializing KDC replay cache 'dfl:krb5kdc_rcache'
/var/log/kadmind.log
Nov 18 22:09:52 cnsz130053 kadmind[4475](Error): Cannot set GSS-API authentication names (keytab not present?), failing.

Has anyone ever seen a problem like this? And know how to solve that?

Thanks for any help!

zhanghao006

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