According to vmware, it can be ignored.

Dashboard alerts for unrecognized requests for XML Api protocol connection in Horizon 2209 (8.7) (90...

But, it prevents us from paying attention when there are real issues.

https://kb.vmware.com/s/article/90398

Scroll down to the Cause and Resolution sections where you will see:

Cause

Hey @CTRIM - we've been having the same issues of the Alert "Detected Unrecognized Requests" being displayed on Horizon's Dashboard similar to the following since we upgraded from Horizon 7.x to 8:

When we drill into the details for the affected CS a bit more we don't get much better info except that there are "XML API Unrecognized Requests":

We don't use UAGs but instead some F5 appliances in our case.  Also the server may vary as well as the number of unrecognized requests - oh and in fact sometimes no CS are actually listed ... just that there are issues . 

We tried to poke VMware support for more details on this and they came to a similar conclusion that they were just "noise" and could be ignored.

Unfortunately I'm not super thrilled about that response since as I think was mentioned, it kind of makes a mess on the Dashboard's System Health section and could lead to accidentally ignoring real alerts.  I wish there was a was to totally suppress these alerts if they are indeed totally ignorable ... aheem VMware gods if you are listening ...

In any case - anyone come across a fix of sorts that they know works please post it here.

Hi,

same issue in our environments since upgrading from 2206 to 2303.

We using F5 as a Loadbalancer. It seems to be a cosmetic issue without any impact. But would be nice to suppress these error messages in UI.

I also have a support ticket open but the support guy don't know how to fix it.

We just recently upgraded from 2111 to 2303 and are seeing the same Alerts.  I just opened a ticket with vmware and they want me to disable our internal and external Load Balancers.  Is this something they had you do or wanting you to do?

They had never asked us to disable that when we were investigating, and to me that seems a little excessive to test in a "production" environment that is actively being used!

It's also frustrating that at least in our case the only change in the infra that triggered these messages was moving from Horizon 7.x to 8.

Also interesting to note is that our larger prod infra has the messages where as a smaller hardly used one does not have any - although both are using F5 appliances. 🤷‍

So it looks like everyone of us is using F5 as a load balancer?

Well we have F5s and you seem to also, but CTRIM above makes reference to a UAG but not specifically an F5 (we don't have any UAG).  So it's tough to say if the F5 is part of the culprit without having a larger sample base of other folks with issues I suppose.

Does anyone else with the issue I wonder have the following combinations?

1. Just and F5 and not any UAG (like myself)
2. Just a UAG and not any F5
3. A combination of UAG and F5

We use F5 with UAG's.

what os version and 8 version, we are using f5s and aren't, but I think our f5 os is a bit old last time I looked.

I've edited my post. We use F5 --> Reverse Proxy UAG --> F5 --> UAG --> F5 --> Connection Brokers

I am having the Same issue. We use F5-->Connection servers. On prem access Only. I have removed the F5 from Load Balancing error has decreased but still shows up just not as often. 

I have a few environments that I support with KEMP load balancers and one with some other brand that I dont recall the name. All have the same issues. Some with UAGs and some without. Its not a F5 issue, its related to any NLB in front of the servers.

I too wish vmware would add a check box to suppress this alert I am tired of having to tell my customers to ignore the alerts.

Interesting question.

Looks like this was "fixed" in 2303. Sounds like UAG would need an update as well.

https://kb.vmware.com/s/article/90398

Not in the few environments I support. Still getting the messages on 2303 and 2306 UAG and connection servers match versions.

Same with 2303 connection servers.

Although my UAG's might not be the latest.

I'm facing this same issue.

I just upgraded to 2303 Connection Servers with 2209.2 UAGs. External connections go through Citrix Netscaler LB and UAGs. Internal connections only go through Citrix Netscaler LB(No UAGs). Just opened an SR with VMWare, I'll see where it goes. Any recent updates from the community side?

Hi have a support ticket opened since months --> SR 23441124806

Support sends me an undocumented property value for ADAM database but it doesn't changed anything.
Today I got a new mail that they work for an hotpatch for my environment. Sounds like that they think I am the only one with this issue