Creo que el problema es apache. Antes te dije que estaba activo porque comprobando el estado me daba ok pero al reiniciar falla y he encontrado lo siguiente:
En el log:]: Stopped LSB: Apache2 web server.
Dec 14 10:41:04 raspberrypi systemd[1]: Starting LSB: Apache2 web server...
Dec 14 10:41:05 raspberrypi apache2[1815]: Starting web server: apache2 failed!
Dec 14 10:41:05 raspberrypi apache2[1815]: The apache2 configtest failed. ... (warning).
Dec 14 10:41:05 raspberrypi apache2[1815]: Output of config test was:
Dec 14 10:41:05 raspberrypi apache2[1815]: AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
Dec 14 10:41:05 raspberrypi apache2[1815]: (2)No such file or directory: AH02291: Cannot access directory '/var/log/apache2/' for main error log
Dec 14 10:41:05 raspberrypi apache2[1815]: (2)No such file or directory: AH02291: Cannot access directory '/var/log/apache2/' for error log of vhost defined at /etc/apache2/sites-enabled/000-default.conf:1
Dec 14 10:41:05 raspberrypi apache2[1815]: AH00014: Configuration check failed
Dec 14 10:41:05 raspberrypi apache2[1815]: Action 'configtest' failed.
Dec 14 10:41:05 raspberrypi apache2[1815]: The Apache error log may have more information.
Dec 14 10:41:05 raspberrypi systemd[1]: apache2.service: control process exited, code=exited status=1
Dec 14 10:41:05 raspberrypi systemd[1]: Failed to start LSB: Apache2 web server.
Y en el archivo 000-default.conf:VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
#ServerName
www.example.com ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
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. El manual se puede seguir al pie de la letra con Jessie, exceptuando lo de Apache.
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