A considerable part of www.cs.uu.nl is only easily accessible from the department's networks. Another related problem is that many restricted websites are only fully accessible from the UU IP number range (18.104.22.168). Examples are ACM, Springer and Siam.
Here is how you can access these sites using SSH.
Let your SSH client set up a "dynamic port forward" with :ssh -D 1080 firstname.lastname@example.org
Next, in your browser, configure localhost:1080 as a SOCKS5 proxy. Now all your webtraffic goes through "some.server.org".
With firefox you can use foxyproxy to make firefox use the proxy (or proxies) for selective addresses or address-ranges.
Note: another way to access sites like this is to use a VPN service (see elsewhere).