Attempting to launch FLUENT (any version) you receive this or a similar error: /ansys_inc/v140/fluent/fluent14.0.0/bin/fluent: line 2609: 22706 Segmentation fault $NO_RUN $CORTEX_PRE $EXE -f $FLUENT_PROD $CX_FLAGS "$CX_FUNCTION"

Hit return to exit.

Resolution 1 : Check Xll Forwarding

Ensure that X11 forwarding is enabled ('ssh -X' when logging in using a terminal or, if accessing through Putty, under the menu 'Connection'->'SSH'->'X11' and tick to enable). Also ensure, if using a Windows machine, that Exceed (or equivalent Linux replicating software) is turned on and functional.

Resolution 2: Comment out or delete all IPV6 information in the /etc/host file. For example, if you have the following in the /etc/host file put a pound symbol in front of each IBV6 entry. You might need to restart the network services.

# special IPv6 addresses localhost
:1 localhost ipv6-localhost ipv6-loopback
fe00::0 ipv6-localnet
ff00::0 ipv6-mcastprefix
ff02::1 ipv6-allnodes
ff02::2 ipv6-allrouters
ff02::3 ipv6-allhosts

Resolution 3: Check your /etc/hosts file and verify that you are not having hostname problem. Also check that this is not a DNS issue. Contact your Systems Administrator for assistance.

You can try the following:

In a Terminal window type: hostname (use the returned hostname in the next command)
Type: ping hostname
It should return something as seen in the following example below:


Verify that the IP_ADDRESS that was returned is the correct IP_ADDRESS for your hostname

If it returns the error: "unknown host hostname" open up a Terminal Windows and CD to the /etc directory. Open up the hosts file. The hosts file should contain at least the following: localhost
IP_ADDRESS hostname

(Where IP_ADDRESS hostname is the IP ADDRESS on the local machine name and then add the Fully Qualified Domain Name (FQDN))

Make the desired updates and save the file. You might need to restart the network services.
Open up a new Terminal Window and try launching FLUENT again.

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