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KDC connections

I am running into an issue where after a stream of many KDC ticket requests, I get a "Cannot contact any KDC for requested realm" error.  However, the KDC is still running, and appears to be able to service requests, even from that same host.  Is there some way I could be trying to make too many simultaneous connections to the KDC, or two many identitcal requests in a row, and the KDC is refusing to talk to me intentionally?  I've tried this test on the same machine as the KDC, so it's not a transient network outage or anything.  I just wanted to make sure there's not a security feature I'm not aware of that's tripping me up here.

I'm using the krb5_get_init_creds_keytab() function for my ticket requests.