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could not contact scm server at, giving up

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I'm up to the cluster installation part and all the hosts are failing with the following error.


Does anyone have any idea about what might be the root cause?


I have already looked at this post however the solution didn't solve the issue in my case. 


I'm using Centos 7, MySQL and my machines are 4CPU, 12GB RAM.


By the way, I have masked the full IP address with X.


Thank you



BEGIN host -t PTR 43-XXX-XX-XX domain name pointer 
END (0) 
using as scm server hostname 
BEGIN which python 
END (0) 
BEGIN python -c 'import socket; import sys; s = socket.socket(socket.AF_INET); s.settimeout(5.0); s.connect((sys.argv[1], int(sys.argv[2]))); s.close();' 7182 
Traceback (most recent call last): 
File "<string>", line 1, in <module> 
File "/usr/lib64/python2.7/", line 224, in meth 
return getattr(self._sock,name)(*args) 
socket.gaierror: [Errno -2] Name or service not known 
END (1) 
could not contact scm server at, giving up 
waiting for rollback request 


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