App cannot perform domain name resolution

I have an app that connects to a remote server and pulls files via FTP. The code was just modified to connect to the server using a domain name rather than the direct IP. Unfortunately it doesn't work anymore. I get
java.net.UnknownHostException: ftp.domain.com
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:364)
        at java.net.Socket.connect(Socket.java:507)
        at java.net.Socket.connect(Socket.java:457)
        at java.net.Socket.<init>(Socket.java:365)
        at java.net.Socket.<init>(Socket.java:178)
        at net.sf.jftp.net.JConnection.run(JConnection.java:128)
        at java.lang.Thread.run(Thread.java:595)The app worked in the past (with just the IP) and does work properly on another computer, which leads me to believe its our server environment. For some reason the domain name is not get resolved... or something along those lines. I am able to perform a manual nslookup on that server. How does an app go about resolving domain names? What other environment related variables can possibly cause this problem?
Thanks

nslookup succeeds, but do other commands (like 'getent hosts xxx' or 'ping xxx')?
If your /etc/nsswitch.conf is misconfigured, then the system will not use DNS, but 'nslookup' could still succeed.
Darren

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http://sharepointchick.com/archive/2012/07/29/setting-up-your-app-domain-for-sharepoint-2013.aspx
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ok so the GPO setting doesn't apply in any case.
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Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

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(C) Copyright 1985-2003 Microsoft Corp.
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