Your load balancer is reporting their address instead of the source IP address. That might be something you want to change.
Otherwise, I'm not sure why you think you have a problem? It sounds as if you are just getting a lot of email. From: Tom Miller [mailto:[email protected]] Sent: Tuesday, May 14, 2013 1:03 PM To: MS-Exchange Admin Issues Subject: Exchange 2010 relay settings I have two Exchange 2010 SP3 CAS servers. They are front-ended by several load balancers. In front of that we have a spam and a/v appliance that filters e-mail first for inbound and outbound. This morning I noticed that Internet mail was going out, but not coming in. The load balancers did not report any errors with connectivity. The spam appliance reported that it could not send messages to Exchange as no resources were available on the Exchange side. Looking at the CAS servers, I saw entries in the app logs: "receive connected relay server_name rejected an incoming connection from IP address x.x.x.x. The maximum number of connections per source (20) for th is connector has been reached by this source IP address." I restarted CAS servers and they started to accept mail again, although I do see that message again. I know I can change this via the MaxInboundConnectionPerSource and MaxInboundConnectionPercentagePerSource. But I'd really like to know how to properly troubleshoot this. The "relay" connectors on the server are limited to specific IP addresses such as our copiers, notification systems, and the load balancers. The App log referred specifically to the IP of the primary load balancer. Other than enabling verbose logging on that connector, how else would one troubleshoot this? Thanks, Tom --- To manage subscriptions click here: or send an email to with the body: unsubscribe exchangelist --- To manage subscriptions click here: or send an email to with the body: unsubscribe exchangelist
