having the same problem, unable to connect my site to the community
following error message when trying to connect:

You must specify a site name.
Your site token must be 64 characters.

site hosted on OVH concrete version:
# concrete5 Version
Core Version - 5.7.3.1
Version Installed - 5.7.3.1
Database Version - 20150109000000

Are you also missing the Captcha exercise?

no captcha exercise proposed in my case

No one can help on this? Really?

Hey, i just updated the SEO values of my home page, retried to connect to community and all seems to work now, dunno if they did something server side

Same here - latest version (on existing project and on a clean new install) of 5.7.3.1.

Any news on this as to what's happening?

Same issue for me with new install. 5.7.3.1 and earlier version 5.6.2.2. I've tried multiple browsers and no avail.

I'm having the same issue with 5.7.3.1. The lack of support for such basic functionality is sorry. Really thinking about the cost of porting site to WP or Drupal given the poor coding surrounding connecting to the community. This requires our developers to manual install add-ons which is terrible when our marketing people could be doing it through the admin interface.

I've tried every fix mentioned in the forums. Still no luck. Would never recommend this CMS.

I'm having the same issue with 5.7.3.1. The lack of support for such basic functionality is sorry. Really thinking about the cost of porting site to WP or Drupal given the poor coding surrounding connecting to the community. This requires our developers to manual install add-ons which is terrible when our marketing people could be doing it through the admin interface.

I've tried every fix mentioned in the forums. Still no luck. Would never recommend this CMS.