All the pc/servers cannot reach Windows update anymore. I have the MX100 behind our ISP router. I have ruled out the ISP router because I can reach WU when I plug a laptop directly in the router. This is not a Windows update troubleshoot problem because it is affecting ALL devices. I'm trying to see whether the MX100 has anything to do with in and how to troubleshoot it.
Any help is appreciated.
I have changed the dns of a local laptop to 188.8.131.52 and still no updates.
I don't see anything in the Meraki firewall that would block this.