Java DNS Caching Solutions

CAS will be changing its IP address on April 14th, 2011. This change will be carried out on the Campus DNS servers which will have their outbound TTL for the cas.ucdavis.edu hostname set to 10 minutes prior to the change.

However, Java-based CAS clients do not automatically pick up the DNS changes. This is caused by an underlying security setting of the old Java Virtual Machine that caches DNS resolutions permanently between restarts. This causes those clients to break after the DNS switch, as they do not update their IP address to the new setting.

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