Did you use xmpp-gmx.gmx.net or xmpp-gmx.gmx.de?
$ host -a xmpp-gmx.gmx.net Trying "xmpp-gmx.gmx.net" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47849 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION: ;xmpp-gmx.gmx.net. IN ANY
;; ANSWER SECTION: xmpp-gmx.gmx.net. 1878 IN A 213.165.65.40
Received 50 bytes from 192.168.1.1#53 in 86 ms
Are you using gmx, 1&1 or web.de? $ host -t SRV -c IN _xmpp-client._tcp.gmx.de _xmpp-client._tcp.gmx.de has SRV record 5 0 5222 xmpp-gmx.gmx.net
$ host -t SRV -c IN _xmpp-client._tcp.web.de _xmpp-client._tcp.web.de has SRV record 5 0 5222 xmpp-webde.gmx.net
$ host -t SRV -c IN _xmpp-client._tcp.online.de _xmpp-client._tcp.online.de has SRV record 5 0 5222 gmx.net
Did you use xmpp-gmx.gmx.net or xmpp-gmx.gmx.de?
$ host -a xmpp-gmx.gmx.net
Trying "xmpp-gmx.gmx.net"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47849
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;xmpp-gmx.gmx.net. IN ANY
;; ANSWER SECTION:
xmpp-gmx.gmx.net. 1878 IN A 213.165.65.40
Received 50 bytes from 192.168.1.1#53 in 86 ms
Are you using gmx, 1&1 or web.de? _tcp.gmx. de _tcp.gmx. de has SRV record 5 0 5222 xmpp-gmx.gmx.net
$ host -t SRV -c IN _xmpp-client.
_xmpp-client.
$ host -t SRV -c IN _xmpp-client. _tcp.web. de _tcp.web. de has SRV record 5 0 5222 xmpp-webde.gmx.net
_xmpp-client.
$ host -t SRV -c IN _xmpp-client. _tcp.online. de _tcp.online. de has SRV record 5 0 5222 gmx.net
_xmpp-client.