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When using [mathopd](http://www.mathopd.org) to serve ikiwiki, be careful of your Umask settings in the mathopd.conf.

With `Umask 026` in mathopd.conf, editing pages resulted in the following errors and a 404 page when the wiki tried to take me to the updated page.

    append_indexes: cannot open .../[destdir]/[outputfile].html
    open: Permission denied

With `Umask 022` in mathopd.conf, editing pages works.

Hopefully this prevents someone else from spending ~2 hours figuring out why this wouldn't work. ;)

> More generally, if your web server uses a nonstandard umask
> or you're getting permissions related problems in the cgi log
> when using ikiwiki, you can force ikiwiki to use a sane umask
> via the `umask` setting in ikiwiki's own setup file. --[[Joey]]