Here is ping output.
Pinging DCSRV1.emp.alverno.edu [10.0.60.30] with 32 bytes of data:

Reply from 10.0.60.30: bytes=32 time<1ms TTL=127
Reply from 10.0.60.30: bytes=32 time<1ms TTL=127
Reply from 10.0.60.30: bytes=32 time<1ms TTL=127
Reply from 10.0.60.30: bytes=32 time<1ms TTL=127

Ping statistics for 10.0.60.30:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms


Thanks,
Jill
-----Original Message-----
From: André Warnier [mailto:a...@ice-sa.com] 
Sent: Thursday, January 20, 2011 1:32 PM
To: Tomcat Users List
Subject: Re: how to configue tomcat ldap 2008
X-HOSTLOC: alverno.edu/10.0.60.9

Jill Han wrote:
...

>> Jan 19, 2011 3:29:26 PM org.apache.catalina.realm.JNDIRealm
> authenticate
>> SEVERE: Exception performing authentication
>> javax.naming.PartialResultException [Root exception is
> javax.naming.CommunicationException: DomainDnsZones.emp.alverno.edu:389
> [Root exception is java.net.UnknownHostException:
> DomainDnsZones.emp.alverno.edu]]

To me, the key seems to be :
UnknownHostException: DomainDnsZones.emp.alverno.edu

The first thing to do, would be to check if that host really exists, AND its 
name/address 
conversion can be done from the server where you are running this.

In other words :
- login to the server running Tomcat, in a console window
- enter :
ping DomainDnsZones.emp.alverno.edu

What do you see ?


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