The Clients page displays client entries for the last 30 days as maximum. If the target device is offline for longer than 30 days without generating traffic in the network, It would not be listed on the page anymore.   If you need to make the feature available to remove the individual client entry and the usage data from Clients page by manual, you may open a support case and ask to enable it from backend.   Hope this would help you out!     ... View more

Okay, I f there are MR11 which may be Pro access point related with the warning messages and upgrading license.   It would be good idea for you to check the following KB and contact to Meraki Technical Support if you need any assistance for the organisation with their visibility and confirmation,   https://documentation.meraki.com/MR/Other_Topics/Legacy_(Pro)_Access_Points_and_Licensing_FAQ   Hope this would help some! ... View more

That looks like message related with upgrading / downgrading license version. As you may know, there are 2 types of license that Enterprise and Advanced Security.   If your organisation has been using Advanced Security license, and needs to use security features (AMP, IDP/IPS, Content Filtering and Geo IP based firewall in L7) on your Security Appliances (MX),  renewing license by Advanced Security license would be the way.   In addition, one of point of license renewal is that you need to renew all of licenses by the license key, as Meraki license is managed by license co-termination which means all of licenses applied in your organisation end up at same time.   The following KBs would help you to understand how licensing works, - https://documentation.meraki.com/zGeneral_Administration/Licensing/Cisco_Meraki_Licensing_Guidelines_and_Limitations#Renewing_your_Dashboard_licensing - https://documentation.meraki.com/zGeneral_Administration/Licensing/Cisco_Meraki_Licensing_Guidelines_and_Limitations/The_Science_Behind_Licensing_Co-Termination   Hope this would help some! ... View more

ECMS2 training is now available in 3 cities (San Francisco, London and Sydney). The page below has details and form for you to show your interest for the enrolment though the seat availability could be limited due to high demand in market,   https://community.meraki.com/t5/ECMS2/ct-p/ecms2   Hope this would help some! ... View more

If the issue is reproducible in the environment, The one of step to troubleshoot this issue is that taking packet capture to see where DNS query / answer is dropped between device reports the issue and the DNS server, because the warning message (Bad DNS) is shown up when the device is unable to receive answer from the configured DNS server.   As you may know, taking packet capture can be done on the Meraki dashboard from Network-wide > Packet capture > select target switch and the uplink port. You can have a look if DNS query is sent from the device and answer for the query comes back properly to the device or not. If DNS answer is not seen in the packet capture, moving this forward closer to DNS server end would be the idea.   Hope this process would help to find out the root cause of this issue.   ... View more