tomcat can not work on vista sometimes

[chenll]

hi, i installed tomcat 6 and jre 1.6 on Windows Vista. i started tomcat by 
clicking the file of bin\tomcat6.exe, and then type http://localhost:8080 in IE 
explorer, sometims it can work and link to webpage of Apache Tomcat, but 
sometimes i failed and it showed that failed to connect.                        
              
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