Why do I receive 'java.net.UnknownHostException: esd.mathworks.com' in the log file when installing MATLAB?
MATLAB: Do I receive ‘java.net.UnknownHostException: esd.mathworks.com’ in the log file when installing MATLAB
MATLAB
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This error occurs if the symbolic links for the installer are missing. The installer uses symbolic links in order to locate the required libraries for installation. This may occur if the installer .zip archive was extracted on a file system that does not support symbolic links. For example, if the files were extracted on a Windows system, this error would occur. To resolve this, the installer should be extracted on a system that supports symbolic links (ext2, ext3, etc.).
This error can also occur when installing from DVD if the DVD is not mounted with the correct permission set. To correct this, please see the related article:
Why do I get the message "xsetup: Permission denied" when running the installer on Linux/Unix?
This is caused when the machine name or hostname ("lumi_It_37" in this case) is not recognized as a valid hostname/nodename while initializing the parallel pool. This is likely due to a corrupted hosts file. Execute the following instruction on the MATLAB command line:
hostname = char(getHostName(java.net.InetAddress.getLocalHost))If the java.net.InetAddress.getLocalHost.getHostName method encounter the same unknown host exception issue, the behavior appears to be related to a corrupted hosts file.
To resolve this issue follow these steps:
1) Change the hosts file. On terminal, edit the file under the directory:
/etc/hostsYou can use the following command at the terminal to access the "hosts" file:
sudo nano /private/etc/hostsPlease make sure to map the valid hostnames to valid IP addresses. Please ping the machine name to test. If the issue still persists, contact your IT administrator. The output should look similar to this:
The second line in this hosts file should correlate to your full qualified domain name (FQDN) and the short hostname. The IP address, FQDN, and short hostname all need to be resolvable via ping on the problem computer.
The hostname of the computer can also be found by running the command hostname from terminal. The IP address and the username for the local host can be searched using the following instructions:
ip = char( getHostAddress(java.net.InetAddress.getLocalHost))user = getenv('UserName')2) After modifying and saving the hosts file, restart networking on your server or client system to make sure the changes were implemented correctly. In most cases, restarting the computer may be the best way to do this. Once networking or the machine is restarted, check the hosts file again to make sure the changes stayed.
3) Retry parpool or validation to verify that the issue is resolved.
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