Connect to backend failed: connect to lsphp failed: 110

On a CloudLinux Server, websites stopped working with the error message “Service Unavailable”. On checking error_log in /usr/local/apache/logs, found following error message

The problem was due to the server got booted using the default CentOS kernel instead of CloudLinux Kernel.

If you were using Cloudlinux kernel, “uname -a” command will show kernel with “lve” in the name. Example 3.10.0-962.3.2.lve1.5.56.el7.x86_64

To see the list of kernels available, run


To set default kernel, run

This will set kernel entry to the first entry.

Verify default kernel with


Reboot the server with

Once rebooted, verify the server is booted with CloudLinux kernel.

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