Trendmicro Deep Security 9.5. Failed to download VIB. ESXi can't connect to DSM Port 4119

Ok. This error is experienced when using Trendmicro Deep Security 9.5 (seems to be other versions also). The problem is that the Trendmicro Deep Security manager isn't resolving DNS queries to the ESXi host. Don't get crazy with it...it really is that simple.

"Failed to download VIB. ESXi can't connect to DSMP Port 4119." This error happens when your trying to upgrade ESX Filter Driver's from one version to a later and more current version. (This is when you see the error window pop up.)

1. Don't try to manually install the VIB file in ESXi through vCLI or any other direct means.

2. Just check the DNS settings on each VMware ESXi host and confirm that your DNS settings are correct. If your getting this error, it's because something is not resolving DNS or (worst case scenario). You have some networking issues.

3. Check your vCenter settings for each ESXi host first before getting hardcore into troubleshooting. (NOTE: Yes. This is the windows vCenter client screenshot. I will only use the horrible new web client when I am absolutely forced to use that junk.)


4. Now that you have re-verified and "fixed" your DNS IP addresses and FQDN's for the domain suffix. Right-click on the "Upgrade Recommended" and run "Upgrade Filter Driver" again.


5. Now the host will enter maintenance mode, reboot and then come up as "Prepared". Be patient. Sometimes it takes a few minutes for the ESXi hosts to boot.

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