The server jabber.rueckgr.at was affected by the recently discovered "Heartbleed" bug in OpenSSL (CVE-2014-0160). In case you're interested in details about the bug and its consequences, refer to heartbleed.com.
The problem has been fixed by updating the affected software and issuing a new SSL certificate. However, any data that has previously been transferred from/to this server may be comprimised. Therefore, it is strongly recommended to change the password of your account as soon as possible.
The details of the new certificate are as follows:
Valid from: 2014-04-09 00:39:07 GMT
Valid until: 2016-04-09 07:47:19 GMT
MD5 fingerprint: 76:12:12:FC:32:12:BD:E2:3C:7C:C9:27:DC:E9:DA:DA
SHA1 fingerprint: 14:AA:9D:32:64:83:91:A9:C8:71:5D:A3:65:3C:F3:4D:09:05:7A:7D
SHA256 fingerprint: CF:40:A9:F4:4A:C7:0A:C5:9A:42:C0:66:03:0B:19:DC:B4:51:1E:7F:26:71:76:2E:9D:F6:2D:79:C6:A2:D5:67
I apologize for any inconvenience.