Constant popup "join Wifi-network"

Perhaps some of the reason it was brought to the proper attention of Apple was due to those

who used Apple Feedback to communicate the issue directly to Apple website personnel...

Hopefully whatever oversight or error behind this odd issue won't repeat again soon.

Or if it does, the temporary cure by Wyrmfire may be re-applied yet again?! 😎

is there a way of getting it to reconnect automatically once I've done the above? As Ive tried to switch it back and it doesn't work.

Your help would be appreciated.

I have been having this same issue for a year now. Using a MacBook Pro OS X Yosemite 10.10.5 (as of this post), and this problem has persisted through updating from Mavericks. The problem was never fixed and doubt it was ever actually addressed by Apple. The only hack listed in this thread isn't ideal if you're using a computer for work on a corporate network that requires a corporate login. I assume that updating the OS to El Capitan won't necessarily fix the issue, either. At most, it might fix the issue but will probably screw something else up.

Is anyone else still having this stupid pop-up box show when connecting to a network?

The box appears as though it could be due to some browser cached item; or

maybe something in Safari. If you force quit Safari and then restart it with the

extensions-off (hold shift key on launch of Safari) that may help.

I've not had that kind of issue; others have and the source(s) may relate to

adware or some thing related to popups, and accidentally downloading

unwanted or unintended software, or just extensions in the browser itself.

The following support link covers several possibilities to your stated issue:

• Stop pop-up ads and adware in Safari - Apple Support

You may need to look further for other kinds of possibly related bits. And

never expect a new OS X to fix an underlying problem that predated it.

Sometimes the cause will be moved along with your old user account.

You could try to see what Console logs suggest, or look at the highlights

in an etrecheck report. Not sure if something such as adwaremedic helps.

Regarding the original topic of this thread, this of course -- isn't about that. LOL 🙂

This worked for me. Thanks. Hope Apple can get to this, maybe sometime this year...
macOS Sierra 10.12.6 / MBP Retina, 15" mid-2015