Hi @RGarrido ,
Ok so if this works sometimes but not all the time, then perhaps something is affecting the network traffic or networking addressing. Before proceeding, remember that SAS has an excellent Technical Support team, and that issues like this are probably best dealt with by speaking with the TS team.
It could be that for the host machine that the CAS Controller has a different hostname depending on how the hostname is being resolved. For example using nslookup (which uses the DNS) for a given IP address may provide a different hostname compared to the one listed within the Viya inventory.ini file. If there is a discrepancy then you could update the /etc/hosts file on the CAS Controller to ensure the hostname(s) & IP address that the CAS Controller can be known as, match the hostname for the CAS Controller in the inventory.ini file.
You should also check that within the inventory.ini file you see the CAS Controller host is listed under the CommandLine group (I'm guessing it is because you note that this is an intermittent problem) e.g.
# The CommandLine host group contains command line interfaces for remote interaction with services. # It should include every host in the deployment. [CommandLine] viyaspre1 viyaconfig1 viyamicro1 viyacas1
You may also want to generally chedk out hotfixes for Viya 3.5 that are focused on CAS e.g. https://support.sas.com/kb/68/026.html
Hope that helps.
--Simon
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