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On RedHat Linux 6.2, when attempting to execute a JSP after the Netscape browser is already open, I get the following error message: "Cannot execute netscape -id 0x3c00171 -raise -remote openURL(http://transmet:8080/mon_101.jsp) and create new browser window. Check that a valid external browser property is set in Options | Web Browsers." This is with Netscape Communicator 4.72, but this does not happen if I choose "View->Web Browser" in the IDE. This only occurs when doing an action that involves JSP execution (executing/debugging JSP or Servlet, Monitor transaction replay). Since this is the default browser setup, this should be fixed ASAP.
I am not able to reproduce it with the same environment Netscape4.72, RH6.2). Try to run the same command from shell (the last parameter must be quoted because it contains parenthesis) to check what is the problem. Also xwininfo -id 0x3c00171 can give you some hint.
Seems to have disappeared now. I have not had this problem with KDE; only have encountered this when using GNOME. However, I cannot reproduce it now even on GNOME. I am marking this bug as "WORKSFORME" until I can find more details on how to reproduce it.
Verified in FFJ 3.0 build 010717_ee.