5508 Management Access lost when 70+ AP's join

[roger perkin]

I am troubleshooting an issue where a 5508 which is hosted behind and ASA5512 is losing management access when we go over about 70 AP's 

It has been running perfectly for many weeks with 34 AP's and I have now brought another office online and the AP count has gone up to 70+ 

I lose management access and also some AP's are stuck in the green/red light cycle. 

The WLC is licensed for 150 AP's following an upgrade from 50 to 150 

What could be causing the loss of management access? 

I am suspecting something on the firewall? 

If I shut down the vlan for the new office management access is restored.

SSH access to the controller works fine throughout 

Thanks

Roger

[Freerk Terpstra]

Which software are you running on your 5508?

Is the traffic being NAT'ed on the ASA? And what is the status of the incoming connections on the ASA when this happends?

show conn | include 1.1.1.1 (IPv4 of the WLC)

[roger perkin]

Traffic is not being NATéd 

Running 7.6.130.0 - 3702 APs

I will find out the status of the connections tmw. 

I suspected an issue on the WLC but it can be easily fixed by dropping some AP's

There must be some resource exhaustion on the ASA or connection limit?

Thanks

[roger perkin]

Problem solved - there was another firewall in the path which was limiting connections to a single IP