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Hi Jay and mMontana, Thanks for your help to both of you. @mMontana, I completely agree with your remark about minimum security and not going below WPA2. As the Squeezebox doesn't implement it, I will only connect it through an ethernet cable.

Hi mMontana, Once again, thanks for your insightful remarks! I will as of today implement WPA3 (never played with this cypher before) in the Zyxel and connect my fairly old Squeezebox with a long ethernet cable. And (even if it's not related to this forum) I will check for the security settings for the Linksys/DD-WRT and…

Thanks for your help, mMontana! I'm not far to share your feelings about what's happening. And I plan to test an ethernet connection as soon as I can make a 5 or 6 m long ethernet cable to connect the squeezebox to the little switch (where I already have successfully connected the Apple TV, so I know this should work). But…