Using a lowercase hostname is typical but I got sloppy on a Windows 7 installation, after all Windows is case insensitive, and I used a mixed case hostname. It raised an interesting error when installing Oracle Database 11g Release 2.

Failed to allocate port(s) in the specified range(s) for the following process(es): JMS
[5540-5559], RMI [5520-5539], Database Control [5500-5519], EM Agent [3938] | [1830-1849]

Refer to the log file at C:\app\McLaughlinM\cfgtoollogs\dbca\orcl\emConfig.log for more details.

You can retry configuring this database with Enterprise Manager
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Here are step-by-step instructions for installing Oracle Database 11g Release 2 on Windows 7. It’s provided in response to questions posted on my step-by-step instructions for installing Oracle 11gR1 on Windows 7. For reference, I posted the former because it didn’t work without intervention. I hadn’t updated step-by-step instructions because Oracle Database 11g Release 2 has always worked for me when installing on Windows 7.

A number of students and blog readers have mentioned that it didn’t work for them. My guess is that they had configuration issues within the Windows 7 environment. There are some Windows 7 configuration caveats before you perform this installation, and they are:

Windows 7 Configuration Steps