After restarting my computer I cannot use mudfish anymore.
This seemed to be the error.
[STDOUT]
[0.000000] [INFO] mudfish v4.4.6 (for x86_64)
[0.000000] [INFO] Timestamp: Mon Nov 19 01:34:06 2018
[0.000000] [INFO] Connection protocol: udp
[0.000000] [INFO] Authenticating…
[0.343729] [INFO] Fetching the static nodes…
[5.500575] [ERROR] MUDEC_00015: Failed to receive information from the master server for MR record: -1 ODR_ETIMEDOUT
[5.500575] [ERROR] MUDEC_00320: Failed to fetch the static node information.
[STDERR]
Empty file.