TNSLSNR for Linux: Version 22.214.171.124.0 - Production on 07-JUN-2010 09:10:36
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System parameter file is /ora/visdb/9.2.0/network/admin/VIS_erpsun/listener.ora
Log messages written to /ora/visdb/9.2.0/network/log/listener.log
Trace information written to /ora/visdb/9.2.0/network/trace/listener.trc
Trace level is currently 0
Started with pid=26851
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=erpsun.sunits.net)(PORT=1521)))
OK, confirm I correctly understand you situation
Windows client is failing to connect to Linux DB server.
To 4 decimal places what Oracle version on client
To 4 decimal places what Oracle version on DB server
You have demonstrated client contact server.
COPY & PASTE commands & results proving server can initiate network/packet exchange with client.