Site previews functionality lost since upgrade to latest 11.5.30

[Jean13]

Just installed a new server with Plesk 11.5.30 on Ubuntu 12.04.2 LTS

About everything was working fine, until I upgraded to 11.5.30 a couple of days ago. Now, I have totally lost the ability to preview sites.
The preview should work in this format: customer-site.tld.192-0-2-12.your-domain.tld

Yes I enabled the site preview. Tried about every recommendation but no luck. Even rebuilding the vhosts.

What other procedure(s) should I apply to revive the "preview of sites" functionality?

Is it possible to go back to release 11.0?

Help is badly needed. Thank you.

Very best,
Jean

 

[Alexey.Plotnitsky]

Perhaps your Plesk DNS service or resolve settings (/etc/resolv.conf) are broken or incorrect.

Can websites be opened in normal mode "Open", not "Preview"?
Does websites open on a client computer?