How to restrict vSphere UI access while maintaining vSphere API functionality?
Although I come across a fair amount of interesting and challenging questions posed by our customers, I have to say this is certainly one of the more stranger question that continues to surface every so often. The question itself is fairly straight forward, but what I find strange is the reasoning and justifications for needing such a solution. In case the title was not a give away, the question is having the ability to restrict a set of user(s) from the vSphere UI while still allowing access to the vSphere API for these same user(s). To be clear, the behavior of vSphere is that if you have vSphere UI access, then you also have vSphere API access which is all based on the permissions a user or group has been granted. There is no way to distinguish or limit access between these interfaces including any vSphere SDK or PowerCLI usage which also relies on vSphere API access. There may be valid use cases for needing such a capability, however from my experience in talking with our customers and field, it feels like this is an attempt to solve organizational and/or process issues. Let give you a few examples that I have come across over the years:  I need to prevent [team|individual] from using the vSphere UI, because they are not using the internal provisioning tools we have built  I need to prevent [team|individual] from using the vSphere UI, because they need to learn how to automate using the vSphere API  I need to prevent [individual] in [team] from using the vSphere UI, because they are making changes to VMs without filing support tickets  I need to prevent [individual] on my [team] from using the vSphere UI, because they are bypassing our change control policies  Whether this surprises you or not, I guess the concept of wanting or being able to block a vSphere UI interface is not necessary new. In fact, I was reminded of this article which I wrote back in 2012 on blocking access to the vSphere C# Client, which was implemented quite a bit by customers to encourage usage of the vSphere Flex Client (RIP) but I certainly have heard customers using it for other reasons like the ones I had listed above. In any case, I was recently reminded of this topic and for some odd reason, I started to ponder about a potential solution . Perhaps it was due to some recent NSX-T firewall rules that I was creating on my VMware Cloud on AWS SDDC which involved specifying specific IP Address(s) which got me thinking along this concept ... The vSphere UI runs as a Tomcat application and I was curious if there was a way to restrict access the vSphere UI endpoint (/ui) which would prevent users from accessing the vSphere UI while still preserving vSphere API access which is under the /sdk endpoint. A quick search online lead me to the Access Control Valve where you can control which remote client IP Addresse(s) are allowed or denied. In the example below, I have used an allow rule and for any IP Address that does not match, you will see the following behavior where the vSphere UI screen will return a 403. However, when connecting to the vSphere API using PowerCLI, you will be able to successfully login. Disclaimer: This is not officially supported by VMware and the configuration changes may not persist with future vCenter Server upgrades. Step 1 - SSH to the VCSA and then edit /usr/lib/vmware-vsphere-ui/server/conf/context.xml and add the following entry:  <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1|localhost|x.x.x.x|y.y.y.y"/>  where x.x.x.x and y.y.y.y are IP Address(s) that wish to allow to connect to vSphere UI. Note: Ensure that the "127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1|localhost" snippet is always included in the allow list which enables various vCenter Server services to communicate locally for proper vCenter Server functionality. Step 2 - Restart the vSphere UI service for the change to go into effect:  service-control --restart vsphere-ui