Help configuring Tomcat 7.0.35 Manager GUI web access on Ubuntu 12

I am new to Tomcat and I am having trouble gaining access to the manager application via my web browser on a new installation.

I am running Tomcat on an Ubuntu 12 machine.  I downloaded with Linux 64-bit zip file from Apache and unzipped it to /opt/apache-tomcat-7.0.35.

Next I modified the conf/tomcat-users.xml file to include the manager-gui role and I added a user and assigned the user to that role.

I restarted Tomcat and verified that it is running (I can browse the default Tomcat page).

The problem is that after following those steps, cannot log in using the credentials I specified in the tomcat-users.xml file.

I suspect that the reason may be because I am trying to connect to the manager application via a remote PC rather than from local host, but I am not sure.

I am trying to follow the instructions I found here:  

http://tomcat.apache.org/tomcat-7.0-doc/manager-howto.html#Configuring_Manager_Application_Access

I repeated the same steps above on my local Windows machine, and everything works fine.  When I go to http://localhost:8080/manager/html, I am able to log in using the information I put in the tomcat-users.xml file, so this process works if I am running Tomcat locally on a Windows machine, but I cannot get it to work when Tomcat is running remotely on an Ubuntu machine.

What else can I check?
jbaird123Asked:
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tvedtemConnect With a Mentor Commented:
OK - i just wondered whether you might be (say) checking files into a config control system from your windows machine and checking out to tomcat..

Next thing I would check is the tomcat error logs.

Also, what does 'cannot log in' mean?  What do you see?
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tvedtemCommented:
Open the config files in vi - check they're not in DOS format.
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jbaird123Author Commented:
tvedtem:

I was already using vi to edit the files on the Ubuntu box. They files are not in DOS format as far as I can tell.

Thanks.
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jbaird123Author Commented:
Ok - while reviewing the log, I discovered a typo in my tomcat-users.xml file!  :)
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