Does YOAST use UDP?

We are not sure what UDP you are referring to here. Can you please elaborate more on how did you disable it and what happens now on your website where the issue is specific to Yoast SEO?

Hi.
We disabled UDP-incomming traffic on the network backbone (We are a webhoster for hundreds of servers).

After this action our customers who use the yoast seo plugin can not longer activate the yoast license.

Hi @pardodog,

Thanks for the information! For questions about Yoast premium products, please contact our support team directly. Unfortunately, per the forum guidelines, we cannot answer questions about our premium products here.

Neither WP core nor Yoast use UDP connections, but each HTTP request may use DNS (53/udp) to resolve name (obtain IP address from domain name). You need be careful with blocking entire UDP traffic (eg. you should leave UDP for loopback connections, add “DNS resolver” locally,…). Also, iptables requires the ip_conntrack module loaded if you want to allow UDP only for outgoing connections.

Hi,

we blocked all incomming UDP except DNS ??

loopback is not blocked. We block on notworklevel (before the data even reached the data center).

Thats the confirmation I hoped for. It doesn’t make much sense that a plugin should communicate over UDP at all. With this answer we can focus our manpower to search elsewere for the problem.

Thanks.