topic Re: Connection Failures 100% or 0%. Running VSZ 5.0 in Access Points - Indoor and Outdoor

Connection Failures 100% or 0%. Running VSZ 5.0

patrick_godfrey — Fri, 23 Nov 2018 04:34:45 GMT

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.

Thank you!

Re: Connection Failures 100% or 0%. Running VSZ 5.0

javier_valdes_c — Fri, 23 Nov 2018 15:22:41 GMT

Hi AJ,

We got a similar issue when a customer upgraded his vSZ to the 3.5 code, connection failures went to the sky.
In our scenario this issue was because there was a bug with the access control lists, mac address access list to be specific. We disabled the access list and the issue was fixed as a workaround.
However, the issue was fix when we upgrade again to a newer version of the 3.5 code.

Your case could be something else, it's better to have a ticket opened with support team, but just wanted to share my experience.

Best regards,

Re: Connection Failures 100% or 0%. Running VSZ 5.0

pasquale_monard — Fri, 23 Nov 2018 22:01:03 GMT

Under Total, you have a breakdown of where those connection failures are occuring broken up into
* Authentication
* Association
* EAP
* RADIUS
* DHCP

What do you see?

I would also open a TAC case.

Re: Connection Failures 100% or 0%. Running VSZ 5.0

patrick_godfrey — Sat, 24 Nov 2018 17:03:10 GMT

Thanks to both of you. I will check that info out on Monday and update. I appreciate the forums being active, as there seems to be so little documentation outside of it.

Re: Connection Failures 100% or 0%. Running VSZ 5.0

marius_steyl — Mon, 03 Dec 2018 15:19:09 GMT

Hi

Have you had any success with this issue, we are also running vSZ5.0 with the exact same issue. In our case this points to a high rate of authentication failures, but I have no idea how to troubleshoot further ?

Re: Connection Failures 100% or 0%. Running VSZ 5.0

karel_decloedt_ — Wed, 16 Jan 2019 15:08:05 GMT

Hi

running vSZ 5.1.0.0.496 and lots of connection failures. HELP.

AP R510

Re: Connection Failures 100% or 0%. Running VSZ 5.0

andrew_giancol1 — Wed, 16 Jan 2019 15:26:55 GMT

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).

Re: Connection Failures 100% or 0%. Running VSZ 5.0

system_reseaux — Fri, 18 Jan 2019 09:05:51 GMT

Hi, we have same problems with version 5.1.0.0.496
Failures Types on the dashboard are about DHCP / EAP and Radius ...

Re: Connection Failures 100% or 0%. Running VSZ 5.0

andrew_giancol1 — Fri, 18 Jan 2019 16:04:05 GMT

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).

Re: Connection Failures 100% or 0%. Running VSZ 5.0

mark_r — Tue, 29 Aug 2023 14:17:29 GMT

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

ZD1200 on v10.5.1.0.255 seeing high connection failure %