MQTT-Library: Failed to connect, timeout during waiting for the server, Linux Mint

Hello everyone,
on my Linux-Machine i get the Error-Message “Failed to connect … timeout during waiting for the server” when i start the MQTT-Example as normal user. If i start Processing as root, connection is ok. With other MQTT-Tools or other Network-Tools i have no such problems.
On my Windows-Machine: same Network, no Problems with Processing.
I use the newest Version of Processing.

Any Idea?
Thanks in advance.

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