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Connection Failures 100% or 0%. Running VSZ 5.0

New Contributor
I'm helping a client, and almost all the APs are flagged with a 100% connection failure. The event log for the AP reads:

(WARNING) AP NAME flagged health [0] because it crossed the threshold [30]. 

Moments later:

(INFORMATIONAL) AP NAME flagged health [100] because it crossed the threshold [30].  

I can find nothing that would be causing this. Clients also don't seem to be having trouble using the network, though WiFi Calling seems to struggle with dropped calls. (not sure if related). 

We made sure that there is no co-channel interference (Smaller channel size, set a static plan, and ended up disabling background scanning (some people said this could effect VoWiFi calling).

Any input or recommendations would be greatly appreciated. I could find very little on the topic except for posts saying that under 3.6 connection failures were being falsely reported. This however, is occurring on 5.0.

Below is a graph of what we are seeing. The same behavior is seen on the 5 Ghz. APs are all 610s, with one 710.

Image_ images_messages_5f91c3f5135b77e2478fa80b_261e9bccdbf477d9fae609897308aafc_RackMultipart2018112318270jchl-934afe3d-c3be-42ae-b3fa-019b47f969a8-1546501112.png1542947584

Thank you! 


New Contributor

running vSZ and lots of connection failures. HELP.

AP R510

Image_ images_messages_5f91c439135b77e2479c8ab1_0f6783661f840f5a774c1dc9054540f4_RackMultipart2019011674714fbm8-9f25ed9c-35af-4031-9f51-e2886b3a2ea8-1367774489.PNG1547651256

Contributor III
I think there is a switch for "log historical connection failures" which may help. otherwise, just because I don't know a better way, I use the packet capture dialog on the AP with the high failure rate. This will give me the disassociation code while i review the captures in Wireshark, and allow me to see which STA has either a bad password or has some other type of issue ( I'm looking at you Surface Pros).

New Contributor
Hi, we have same problems with version
Failures Types on the dashboard are about DHCP / EAP and Radius ...

Contributor III
wow, so when I see dhcp issues, i immediately look for my Wireshark to confirm. in my case, this is almost always either a Trunk DHCP trust issue, DHCP helper issue, or a Vlan traversal issue. sometimes by using pcap on the dhcp server, i can see "Oh my requests are coming in from the wrong vlan gateway." which I've seen in networks with a collection of a different manufacturer or versions of switches. (3560, 3750 cisco, 12.2 IOS to 15.x IOS).

Were you able to resolve this and if so how did you get to the resolution?

ZD1200 on v10. seeing high connection failure %