The monetdb project's CVS data is in read-only mode, so the project may have switched over to another source-code-management system. To check, visit the Project Summary Page for monetdb and see if the menubar lists a newer code repository, such as SVN or Git.
The CVS data can be accessed as follows.
You can run a per-module CVS checkout via pserver protocol:
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P MonetDB
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P MonetDB4
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P MonetDB5
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P buildtools
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P clients
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P geom
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P java
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P pathfinder
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P pf-haskell
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P pf-tools
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P sql
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P template
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P testing
cvs -z3 -d:pserver:anonymous@a.cvs.sourceforge.net:/cvsroot/monetdb co -P xml
You can view a list of files or copy all the CVS repository data via rsync (the 1st command lists the files, the 2nd copies):
rsync -a a.cvs.sourceforge.net::cvsroot/monetdb/
rsync -ai a.cvs.sourceforge.net::cvsroot/monetdb/ /my/local/dest/dir/
If you are a project admin for monetdb, you can request that this page redirect to another repo on your project by submitting a support request.