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There is new firmware that fixes issues with memory leaks on certain builds when dtls hello verify request is enabled. I believe official advise is update to latest build and turn the dtls hello verify request on via the set dtls profile cli command once DTSL is re enabled on the NS GW Vserver

Thanks John!

Yes, the latest builds have implemented a fix for the helloverifyrequest memory leak, so if you have a use case for DTLS then you want to move to the latest build and enable that as per the kb article.

so far we haven't had any issues, but are still waiting to push the new build to our service customers and enabling DTLS

Old post but still... 12.1.60.19 covers vulnerability and also DDOS issue... You may have to upgrade firmware to this version...