Problem adding an IS to manage

I am trying to add an integration server in the manager server and I get the error … “wm.server.ping is successful but Manager ping failed”. I made sure I can ping IS from manager server and vice versa. Below is a part of the server logs in the manager server. Did anyone see similar errors ?

[1554]2006-12-12 18:40:31 GMT [ISU.0000.9999D] IsCascadingAgent.setObjectStatus Integration Server 192.231.185.87:6861 failed: java.lang.InterruptedException
[1553]2006-12-12 18:40:14 GMT [ISU.0000.9999D] CascadingAgent.ConnectAndLoad wm.server.ping is successful but Manager ping failed
[1552] IgnoredList = [Ljavax.management.ObjectName;@16922e5b
[1551] source omi.wm.isdiscovery.IntegrationServerDiscovery:name=static
[1550] NOTIFICATION jmx.attributes.change 67
[1549]2006-12-12 18:39:55 GMT [ISU.0000.9999D] Listener.handleNotification
[1548] source omi.wm.isdiscovery.IntegrationServerDiscovery:name=static
[1547] NOTIFICATION omi.discovery.resource 0
[1546]2006-12-12 18:39:55 GMT [ISU.0000.9999D] Listener.handleNotification