title: Crystal Reports 2008 Unknown Database Connection Error to Oracle server
body: <p>I'm having some problems here with Crystal reports 2008 SP3 installed on Windows 7 64bit with Oracle 10g client. Whenever I try to run a report or do a Database verify or Logon to the database I get the quite unhelpful "Unknown Database Connection Error " error message. The only option from here is to click OK. </p>
  
  <p>Oracle 10g is installed as Runtime and has 10.2.04 patch applied. Oracle path setting is correct and Oracle is working with an bespoke Oracle Application as well as SQLPlus TNSPing etc...</p>
  
  <p>There is some evidence of people having this problem around the web but no definite resolution. Does anyone here have any good suggestions?
  Thanks </p>
  
  <p>sqlnet.ora settings</p>
  
  <pre><code>trace_level_client = 16 
  trace_file_client = cli 
  trace_directory_client = c:\trace 
  trace_unique_client = on 
  trace_timestamp_client = on 
  trace_filelen_client = 100 
  trace_fileno_client = 2 
  log_file_client = cli 
  log_directory_client = c:\trace\log 
  tnsping.trace_directory = c:\trace\trace 
  tnsping.trace_level = admin 
  </code></pre>