Can't deploy / undeploy web applications on Glassfish

When we tried to publish a new web application to Glassfish (v2.1.1) this morning, we got the following mystic message:

CLI171 Command deploy failed : While redeploying, trying to stop the application in target server failed; Error Flushing ConfigContext com.sun.enterprise.config.ConfigContext: Url=$glassfish_home/domains/release/config/domain.xml, ReadOnly=false, ResolvePath=true, LastModified Timestamp=1312828827000, isChanged=false, Autocommit=false, isConfigBeanNull=false

It took us a while to realize that somehow domain.xml lost the write permission overnight, so Glassfish cannot add or delete the web application in domain.xml.

Glassfish team should hire someone who can write messages for a normal human being :)