Starting Mathematica remotely on a Linux/UNIX host gives me error messages about missing fonts. What can I do?

Mathematica uses tons of customized fonts to display typeset mathematical expressions, graphics labels and such. In contrast to most other X11 applications, the presence of the fonts needed is checked for already at startup.

If you get error messages like

X Error of failed request: 86
Major opcode of failed request: 51 (X_SetFontPath)
Serial number of failed request: 9
Current serial number in output stream: 11

or similar, you’ll have to reconnect the X server of your terminal to the network font server. To do that, just exit your X session completely and log in again.

If you’re using a “software X terminal” on a Macintosh or a PC, type the command

xset +fp tcp/fonts:7100

to add a network font server (replace fonts with its name) to the list of font directories of your X Window server.