ssh -D 12345 lxplus.cern.ch
and leave that ssh session open for all time you want to talk to the server
then manually set proxy configuration of your browser in such a way the SOCKS proxy point to localhost:12345 (see the picture below for an example with Firefox, try both SOCKSv4 or SOCKSv5).
At this point you should be able to see the page http://vomcs54.cern.ch:8888