Looks more like an Apache config problem than Xymon. Do you have FollowSymLinks set?

e.g.

DocumentRoot "/var/www/html"

<Directory "/var/www/html"> Options Indexes FollowSymLinks MultiViews AllowOverride None Require all granted </Directory>

Then I would take a look at the apache error log, it's usually pretty helpful in pointing out what the problem is.

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