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the default seems to be 3 min.
it looks like there is an option called 'kdc_timeout' to put in the [libdefaults] section in the blappserv_krb5.conf. (from here http://www.daemon-systems.org/man/krb5.conf.5.html)
however there is a bug listed for this:
so i'm not sure kdc_timeout that will do anything - the bug affects a different version and platform of the jvm. you could also look at ‘max_retries’ and udp_preference_limit. which are referenced in the articles above.
after any config changes in the blappserv_krb5.conf file you need to restart the appserver.