How to clean up DNS cache for ITO server


We have some servers change their hostnames and their IPs remain the same. And of course we have updated the DNS. But in ITO alarm browser, it still displays old host name if an alarm is triggered on one of them.

The new hostnames could be resolved correctly on ITO server CLI using nslookup, so I believe the DNS is working fine.
I've tried "/opt/OV/bin/ovconfchg -ovrg server -ns opc -set OPC_NAMESRV_DISABLE_CACHE TRUE " to cut off the cache and the issue remains.

DO you have any advice? Thanks in advance
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