Cannot telnet to primary IP address

[davidhvoss]

I have an inside interface on our Internet edge router that has a primary IP and three secondary IP addressess.  I can ping all four of them from the Internet and trace to them as well.  I can telnet to all of the secondary IP's but not the primary.  I also cannot telnet to any other device on that subnet.  All ACL's on the device look fine and would not block a telnet session.  Anyone seen this before?  Why would the primary IP only not be reachable?

[davidhvoss]

Here's an update.  We cannot ping any device on that subnet unless that device is rebooted.  Then, we can reach it.  So, not only can we not telnet to the primary IP on the interface, we cannot ICMP ping to the devices on that subnet unless they are reloaded.