I have the feeling it has something to do with the DNS… openfire error log shows when I invite a gmail account to Spark: “error trying to connect to remote server: gmail.com(DNS lookup: gmail.com:5269)”
Inviting a jabber.org account gives no problem. jabber.org is shown in the server session table.
I’m directly connected to the internet without any firewalls and all ports are redirected to the openfire server.