We upgraded the application to run with PHP 8.1 and just removed all packages from Ondrej's Repository and installed PHP 8.1 from the official jammy Repo. Same issue: After reload of apache2 some apache2 processes remain in state "Sending Reply", netstat showing inbound HTTPS connections in state CLOSE_WAIT. Will report back if the processes vanish as soon as the tcp connections are dropped. % apt-cache policy $(dpkg -l | grep php | awk '{print $2}') php-common: Installed: 2:92ubuntu1 Candidate: 2:92ubuntu1 Version table: *** 2:92ubuntu1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages 100 /var/lib/dpkg/status php-db: Installed: 1.10.0-1build4 Candidate: 1.10.0-1build4 Version table: *** 1.10.0-1build4 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php-pear: Installed: 1:1.10.12+submodules+notgz+20210212-1ubuntu3 Candidate: 1:1.10.12+submodules+notgz+20210212-1ubuntu3 Version table: *** 1:1.10.12+submodules+notgz+20210212-1ubuntu3 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages 100 /var/lib/dpkg/status php8.1-apcu: Installed: 5.1.21+4.0.11-7ubuntu1 Candidate: 5.1.21+4.0.11-7ubuntu1 Version table: *** 5.1.21+4.0.11-7ubuntu1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-bcmath: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages php8.1-cgi: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-cli: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-common: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-curl: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-dba: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages php8.1-gd: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-igbinary: Installed: 3.2.6+2.0.8-7ubuntu1 Candidate: 3.2.6+2.0.8-7ubuntu1 Version table: *** 3.2.6+2.0.8-7ubuntu1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-imagick: Installed: 3.6.0-4ubuntu1 Candidate: 3.6.0-4ubuntu1 Version table: *** 3.6.0-4ubuntu1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-intl: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages php8.1-mbstring: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-memcached: Installed: 3.1.5+2.2.0-14.1 Candidate: 3.1.5+2.2.0-14.1 Version table: *** 3.1.5+2.2.0-14.1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-msgpack: Installed: 2.2.0~rc1+2.1.2+0.5.7-6 Candidate: 2.2.0~rc1+2.1.2+0.5.7-6 Version table: *** 2.2.0~rc1+2.1.2+0.5.7-6 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-mysql: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-oauth: Installed: 2.0.7+1.2.3-14 Candidate: 2.0.7+1.2.3-14 Version table: *** 2.0.7+1.2.3-14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-opcache: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-phpdbg: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages php8.1-readline: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-redis: Installed: 5.3.5+4.3.0-5.1 Candidate: 5.3.5+4.3.0-5.1 Version table: *** 5.3.5+4.3.0-5.1 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-xml: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/main amd64 Packages php8.1-xmlrpc: Installed: 3:1.0.0~rc3-2 Candidate: 3:1.0.0~rc3-2 Version table: *** 3:1.0.0~rc3-2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages 100 /var/lib/dpkg/status php8.1-zip: Installed: 8.1.2-1ubuntu2.14 Candidate: 8.1.2-1ubuntu2.14 Version table: *** 8.1.2-1ubuntu2.14 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages 100 /var/lib/dpkg/status 8.1.2-1ubuntu2 500 500 http://eu-central-1.ec2.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages % ps f -o user,pid,nice,%cpu,%mem,cputime,etime,thcount,command ax USER PID NI %CPU %MEM TIME ELAPSED THCNT COMMAND root 1184655 0 0.0 0.1 00:00:00 37:45 1 /usr/sbin/apache2 -k start www-data 1184658 0 0.0 0.2 00:00:00 37:45 3 \_ /usr/sbin/apache2 -k start www-data 1184659 0 0.0 0.2 00:00:01 37:45 6 \_ /usr/sbin/apache2 -k start www-data 1184661 0 0.0 0.2 00:00:01 37:45 4 \_ /usr/sbin/apache2 -k start www-data 1184991 0 0.0 0.0 00:00:00 36:44 1 \_ /usr/sbin/apache2 -k start netto 1185257 0 2.1 0.7 00:00:47 36:42 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185265 0 1.2 0.7 00:00:28 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185268 0 1.7 1.2 00:00:37 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185270 0 1.3 0.8 00:00:29 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185272 0 0.5 0.7 00:00:12 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185275 0 1.2 0.7 00:00:26 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185278 0 1.2 0.7 00:00:28 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185279 0 2.1 0.7 00:00:47 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185280 0 1.5 0.7 00:00:33 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185284 0 1.4 1.1 00:00:32 36:41 1 | \_ /usr/lib/cgi-bin/php8.1 netto 1185380 0 0.2 0.6 00:00:03 32:50 1 | \_ /usr/lib/cgi-bin/php8.1 www-data 1184992 0 0.8 0.3 00:00:19 36:42 52 \_ /usr/sbin/apache2 -k start www-data 1184993 0 1.1 0.4 00:00:26 36:42 52 \_ /usr/sbin/apache2 -k start www-data 1184994 0 0.9 0.3 00:00:21 36:42 52 \_ /usr/sbin/apache2 -k start www-data 1184995 0 1.8 0.4 00:00:41 36:42 52 \_ /usr/sbin/apache2 -k start www-data 1184996 0 2.6 0.5 00:00:59 36:42 52 \_ /usr/sbin/apache2 -k start % netstat -antpe | grep -P '1184658|1184659|1184661' tcp6 1 0 10.0.XX.XXX:443 147.161.XXX.XX:42109 CLOSE_WAIT 33 148913646 1184661/apache2 tcp6 1 0 10.0.XX.XXX:443 213.146.XX.XXX:28798 CLOSE_WAIT 33 148913407 1184659/apache2 tcp6 1 0 10.0.XX.XXX:443 80.187.XXX.XXX:31142 CLOSE_WAIT 33 148913578 1184658/apache2 tcp6 1 0 10.0.XX.XXX:443 89.245.XX.XXX:15493 CLOSE_WAIT 33 148914283 1184659/apache2 tcp6 1 0 10.0.XX.XXX:443 152.89.XX.XXX:32704 CLOSE_WAIT 33 148913526 1184659/apache2 tcp6 1 0 10.0.XX.XXX:443 93.104.XX.XXX:63624 CLOSE_WAIT 33 148913718 1184659/apache2