We are experiencing issues with the WLC after upgrading IOS from 22.214.171.124 to 126.96.36.199. After updating IOS on WLC, observed occurring errors and also unable to access Graphical User Interface, which frequently shows as unable to connect. And we were also requested for check the possibly for WLC use in HA mode as new IOS release 7.4 is supported for HA mode. We are getting error as attached.
Emweb handle table overflow issue has been corrected in code 8.0 MR1 , here are few details( includes other resolved issues )
Yes 7.4 version supports HA mode but check it has some restrictions too, if possible upgrade to latest IOS version of WLC:
Please refer to the below community :
and the document file link: