Alex,
To diagnose issues with glassfish windows services, I edit asadmin.bat and on the end of the second to last line "the java call line" I redirect the output to a file with > c:\temp\whatever.txt
Then when I start the service and it fails, I can see what its expecting. I'm currently using services for one DAS and two nodeagents (3 total services) on the same machine with no issues.
Just remember to remove the redirect when you're done as it does sometimes cause the java processes to hang.
HTH,
Andrew
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