401 Unauthorized error while logging in Manager-App of Tomcat

OK, I had this error too. Couldn't find the bug, couldn't find the bug, couldn't find the bug. My "tomcat-users" block looked just like this.

<tomcat-users>
<role rolename="manager-gui"/>
<user name="tomcat" password="s3cret" roles="standard,manager-gui"/>
</tomcat-users>

FINALLY FOUND THE BUG. I kept editing the XML inside the XML comment block:

<!--
<tomcat-users>
<role rolename="manager-gui"/>
<user name="tomcat" password="s3cret" roles="standard,manager-gui"/>
</tomcat-users>
-->

DOH!

So: don't forget to remove the "".

Sorry, I have to ask the obvious: Did you restart Tomcat?

If that doesn't work, try adding "admin-gui" to your roles:

<user name="tomcat" password="s3cret" roles="admin-gui,standard,manager-gui"/>

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