Hello, I recently upgraded my library to the following and didn't notice any errors during the upgrade. Koha version: 17.11.01.000 OS version ('uname -a'): Linux ip-172-31-36-26 4.4.0-109-generic #132-Ubuntu SMP Tue Jan 9 19:52:39 UTC 2018 x86_64 Perl version: 5.022001 MySQL version: mysql Ver 15.1 Distrib 10.0.33-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2 Apache version: Server version: Apache/2.4.18 (Ubuntu) Memcached: Servers: undefined Zebra version: Zebra 2.0.59 However, when I tried to access the Intranet (https://library.sj.org.za:8080) Chrome gives an 'Err empty response'. I tried it in Safari and got a similar message. But I can see the OPAC (https://library.sj.org.za/) just fine. On the localhost I can access the Intranet (using lynx), which made me think perhaps the problem is with Apache to the outside? But Apache is running. I looked in the error logs and found: tail /var/log/apache2/error.log [Sat Jan 20 06:26:11.494741 2018] [mpm_prefork:notice] [pid 8277] AH00163: Apache/2.4.18 (Ubuntu) mpm-itk/2.4.7-04 OpenSSL/1.0.2g configured -- resuming normal operations [Sat Jan 20 06:26:11.494755 2018] [core:notice] [pid 8277] AH00094: Command line: '/usr/sbin/apache2' [Sat Jan 20 06:26:11.714372 2018] [mpm_prefork:notice] [pid 8277] AH00171: Graceful restart requested, doing restart [Sat Jan 20 06:26:11.720326 2018] [core:warn] [pid 8277] AH00111: Config variable ${instance} is not defined [Sat Jan 20 06:26:11.720339 2018] [core:warn] [pid 8277] AH00111: Config variable ${instance} is not defined [Sat Jan 20 06:26:11.724453 2018] [mpm_prefork:notice] [pid 8277] AH00163: Apache/2.4.18 (Ubuntu) mpm-itk/2.4.7-04 OpenSSL/1.0.2g configured -- resuming normal operations [Sat Jan 20 06:26:11.724460 2018] [core:notice] [pid 8277] AH00094: Command line: '/usr/sbin/apache2' My vhost configuration for the Intranet is: <VirtualHost *:8080> Include /etc/koha/apache-shared.conf Include /etc/koha/apache-shared-intranet.conf ServerName library.sj.org.za SetEnv KOHA_CONF "/etc/koha/sites/library/koha-conf.xml" SetEnv MEMCACHED_SERVERS "" SetEnv MEMCACHED_NAMESPACE "" AssignUserID library-koha library-koha ErrorLog /var/log/koha/library/intranet-error.log # TransferLog /var/log/koha/library/intranet-access.log # RewriteLog /var/log/koha/library/intranet-rewrite.log ScriptAlias /coverflow.pl "/var/lib/koha/library/plugins/Koha /Plugin/Com/ByWaterSolutions/CoverFlow/coverflow.pl" Alias /plugin "/var/lib/koha/library/plugins" # The stanza below is needed for Apache 2.4+ <Directory /var/lib/koha/library/plugins> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory> SSLCertificateFile /etc/letsencrypt/live/library.sj.org.za/cert.pem SSLCertificateKeyFile /etc/letsencrypt/live/library.sj.org.za/privkey.pem Include /etc/letsencrypt/options-ssl-apache.conf ServerName library.sj.org.za SSLCertificateChainFile /etc/letsencrypt/live/library.sj.org.za/chain.pem </VirtualHost> I'm running this on an Amazon EC2 instance. Has anyone any ideas on why it would just stop working after a routine sudo apt-get upgrade ? I'd be grateful for any hints or help. Matthew