Forum Discussion
M365 Exchange Admin Center intermittently unavailable.
Been dealing with an issue for about a week now where the Exchange Admin Center becomes unavailable for a few minutes at a time. Then comes back, then is unavailable again.
- It's only the EAC. All the other admin centers (SharePoint, Teams, Security, etc...) are available and it's only within the local network.
- When I test outside of the network, EAC is available.
- When I test through a PowerShell connection, it works.
- When I lose my connection, my colleagues on the network do as well - so it isn't something local to my computer.
The one change to the network that was made within the last couple of weeks is DNS scavenging has been turned on.
- Discovered what the issue was: It was DNS.
Over the course of a couple of months, we had reports of users unable to access certain websites as well. Turns out, a fellow admin applied a change in our DNS to direct traffic to our web server on Azure through an Azure Site-to-Site VPN. This caused all traffic destined for that same web host from our domain to be directed to <zone>.azure.com - including those two sites that were hosted on Azure and admin.exchange.microsoft.com.
- Discovered what the issue was: It was DNS.
Over the course of a couple of months, we had reports of users unable to access certain websites as well. Turns out, a fellow admin applied a change in our DNS to direct traffic to our web server on Azure through an Azure Site-to-Site VPN. This caused all traffic destined for that same web host from our domain to be directed to <zone>.azure.com - including those two sites that were hosted on Azure and admin.exchange.microsoft.com. - I've tried both. When it goes down, it's down for me as well as the rest of the IT group. Inprivate browser window has the same behavior.
