# \#ddos-protection

**URL:** https://community.a10networks.com/tag/ddos-protection/93.md

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## [agalaxy](https://community.a10networks.com/t/agalaxy/531)

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**Author:** [@mariperezben](https://community.a10networks.com/u/mariperezben)\
**Replies:** 1\
**Last updated:** [November 7, 2018, 6:02pm UTC](https://community.a10networks.com/t/agalaxy/531 "2018-11-07T18:02:25Z")

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Hello. I am new with agalaxy, today in the TPS I saw the following message: Error \[DDET\]:zone=port\_443 port=443 protocol=HTTPS level=1 event-type=DDOS\_ZONE\_ESCALATION Error Response Status: Notification failed. Plea…

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## [NTP Reflection Attack](https://community.a10networks.com/t/ntp-reflection-attack/275)

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**Author:** [@cdmoss](https://community.a10networks.com/u/cdmoss)\
**Replies:** 1\
**Last updated:** [April 30, 2014, 4:57am UTC](https://community.a10networks.com/t/ntp-reflection-attack/275 "2014-04-30T04:57:52Z")

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Hello All, This aflex may be used to protect against a NTP Reflection Attack (CVE-2013-5211). Apply this to the virtual service for NTP, udp port 123. This aFleX detects and drops the NTP Reflection attack -reject Monl…

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## [DNS NXDOMAIN Attack Aflex](https://community.a10networks.com/t/dns-nxdomain-attack-aflex/273)

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**Author:** [@system](https://community.a10networks.com/u/system)\
**Replies:** 0\
**Last updated:** [April 8, 2014, 4:09pm UTC](https://community.a10networks.com/t/dns-nxdomain-attack-aflex/273 "2014-04-08T16:09:41Z")

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All, this may be used as a template to protect against DNS NXDOMAIN attacks. The aFlex will dynamically build a table of FQDNs based on observed DNS replies that are ‘NXDOMAIN’. Entries are stored for an hour (3600 sec…