Linux Server Showing down in HC cluster

Question: Linux Server status is showing down, how do I fix it?

Solution:
Please ensure the following points:

    1.
Linux server build should be the same which is running on windows server. Verify this from command: 
          hc9 –version
          If it is different then apply same build on both windows & linux by following this Link.

    2.
HC database server IP should be included in hosts.allow file located in /usr/local/hostingcontroller/etc.

    3.
Add IP under 127.0.0.1.

    4.
If firewall is enabled on windows or linux server then make sure that following ports are allowed in it:
          HC Server port = 8788
          HC Remoting port = 8789 
    
    5. 
In Fedora/Centos operating system you can disable built-in firewall by using this command:
         /sbin/chkconfig iptables off
         /sbin/service iptables stop 

    6. 
On Linux Server, Selinux must be disabled (applies only for Fedora/Centos/Red Hat Enterprise).
          vi  /etc/selinux/config
          SELINUX=disabled

    7. 
Restart HC service. 
          hc9 restart

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