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Every time I try to execute sudo su - or any other sudo command for this matter my server hangs, sometimes it take 10 mins to respond and sometimes it never does.

I checked /etc/hosts file which was configured correctly. I also checked /etc/resolv.conf file which looked good as well. any suggestions?

I am running redhat 6.9

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So,  do you have any way of becoming root? – G-Man Oct 28 '17 at 6:09
    
Yes.. Sometimes it allows me to become root – Ahmed Soliman Oct 28 '17 at 6:10
    
Have you tried running sudo after you’re already root?  Does it still hang then?  If so, you might try running strace (or some similar program) on it. – G-Man Oct 28 '17 at 6:15
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When does it hang -- before asking for the password or after? (Also, strace sudo -i or so might be your friend, even if its output is daunting, because you can see what it's trying to do when it hangs.) – Ulrich Schwarz Oct 28 '17 at 6:16
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@GAD3R I think that resolved my issue – Ahmed Soliman Oct 28 '17 at 18:00
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The problem can reproduced when the hostname is changed , edit your /etc/hosts by adding the output of echo $HOSTNAME after 127.0.0.1:

127.0.0.1  hostname
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I configured it correctly, the issue was fixed but now its back again for no reason. Not sure what the issue is still :( – Ahmed Soliman Oct 28 '17 at 21:29

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