Thanks for the suggestions. Here are the results: dnessett@Mount:/etc/apache2$ grep -r Listen sites-available/000-default.conf:Listen localhost:4443 ssl; ports.conf:#Listen 80 ports.conf: Listen 4443 ports.conf: Listen 443 dnessett@Mount:/etc/apache2$ The ports.conf entry with Listen 443 is for mod_gnutls. Might this be the problem? I am not familiar with mod_gnutls, but it does not appear in any other active configuration file: dnessett@Mount:/etc/apache2$ cat ports.conf # If you just change the port or add more ports here, you will likely also # have to change the VirtualHost statement in # /etc/apache2/sites-enabled/000-default.conf #Listen 80 <IfModule ssl_module> Listen 4443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> dnessett@Mount:/etc/apache2$ grep -r gnutls ports.conf:<IfModule mod_gnutls.c> dnessett@Mount:/etc/apache2$ # vim: syntax=apache ts=4 sw=4 sts=4 sr noet The apache error log does not give much information on this problem: dnessett@Mount:/var/log/apache2$ cat error.log.1 [Wed Dec 14 14:32:34.057530 2022] [mpm_event:notice] [pid 1085:tid 3082604736] AH00489: Apache/2.4.29 (Ubuntu) configured -- resuming normal operations [Wed Dec 14 14:32:34.057692 2022] [core:notice] [pid 1085:tid 3082604736] AH00094: Command line: '/usr/sbin/apache2' [Wed Dec 14 17:31:53.108447 2022] [mpm_event:notice] [pid 1085:tid 3082604736] AH00491: caught SIGTERM, shutting down [Wed Dec 14 22:16:33.935138 2022] [mpm_event:notice] [pid 1059:tid 3082719424] AH00489: Apache/2.4.29 (Ubuntu) configured -- resuming normal operations [Wed Dec 14 22:16:34.030023 2022] [core:notice] [pid 1059:tid 3082719424] AH00094: Command line: '/usr/sbin/apache2' [Wed Dec 14 22:18:39.347403 2022] [mpm_event:notice] [pid 1059:tid 3082719424] AH00491: caught SIGTERM, shutting down dnessett@Mount:/var/log/apache2$ There is a semicolon after the Listen localhost:4443. I was following the instructions given in the sslh installation guide: https://ostechnix.com/sslh-share-port-https-ssh/ I have changed the references to localhost in the one Listen to 127.0.0.1, as you suggest.
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