wireshark: Couldn't run /usr/sbin/dumpcap in child process

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http://unix.stackexchange.com – When I run Wireshark, It shows the following message: Couldn't run /usr/sbin/dumpcap in child process: Permission denied Are you a member of the 'wireshark' group? Try running 'usermod -a -G wireshark _your_username_' as root. I ran this command: usermod -a -G wireshark myusername and checked my groups using groups myusername and I was added to the wireshark group. But I still get that error message. [nima@nma ~]$ groups nima nima : nima wheel dialout wireshark [nima@nma ~]$ ls -l /usr/sbin/dumpcap -rwxr-x--- 1 root wireshark 67884 Aug 16 12:04 /usr/sbin/dumpcap [nima@nma ~]$ /usr/sbin/du (HowTos)