Wow, what browser are you using? This site is old. It should render pretty much on anything I guess.. FF 2.x included ;)

What about IA version? I wonder if IPv6 is a problem here:

  grx.gnu.de is an alias for https.gerwinski.de.
  https.gerwinski.de is an alias for mx3.gerwinski.de.
  mx3.gerwinski.de has address 88.198.170.59
  mx3.gerwinski.de has IPv6 address 2a01:4f8:192:4405::170:59