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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 t...
- 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.
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.