Thanx for the response:
-can you use the webmail horde with the same credentials of users ?
yes using ip, servername and domain.
-the url where roundcube is reachable is
https://sme-ip/roundcube ?
yes, the login page loads and the
-do you have dovecot updated manually ?
no, I don't think so
-didi you install te old version of roundcube previously in sme7contribs ?
I don't think so on this server. I did check that there was no trace of roundcube but I may have missed something. On the second server definitely not. It is a brand new install of sme8.2.
-do you take a look to google when you search "Connection to storage server failed."
I did, but did not yet find an idea as to what might be going on. Those installs are also quite different with roundcube living in /opt etc.
-who is acron.biz ?
That is my domain. It fails on both the domain and the server name.