migrating my Debian 11 Linux system to version 12 (Bookworm), my ISPConfig setup has been experienci

Hello,

Since migrating my Debian 11 Linux system to version 12 (Bookworm), my ISPConfig setup has been experiencing some issues—specifically with the webmail system.
Postfix and Dovecot are working fine, but I am unable to access my email via: https://xx.xx.xx.xx:8081/squirrelmail/
Here is the displayed message:

Oops... something went wrong!
An internal error has occurred. Your request cannot be processed at this time.
For administrators: Please check the application and/or server error logs for more information.

What could be causing this type of message? There is no information in the log files (nginx, ISPConfig, syslog)...

 

Yes i am still using SquirrelMail like before with debian 11
I have on my server diferents PHP versions from PHP7.4 TO PHP 8.4.

 

I found these massage in /var/log/ispconfig/update.log
i am running nginx not apache

Sat Jun 13 10:53:01 AM CEST 2026 - [ISPConfig] - Could not check apache version, apachectl not found.
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3600: EXECUTED: cp -rf ../interface /usr/local/ispconfig
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3604: EXECUTED: cp -rf ../server /usr/local/ispconfig
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3611: EXECUTED: cp -rf ../security /usr/local/ispconfig
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3765: EXECUTED: chown root:root /usr/local/ispconfig
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3767: EXECUTED: chmod 755 /usr/local/ispconfig
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3771: EXECUTED: chmod -R 750 /usr/local/ispconfig/extensions /usr/local/ispconfig/interface /usr/local/ispconfig/security /usr/local/ispconfig/server
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3775: EXECUTED: chown -R ispconfig:ispconfig /usr/local/ispconfig/interface
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3779: EXECUTED: chown ispconfig:ispconfig /usr/local/ispconfig/extensions
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3783: EXECUTED: chmod -R 755 /usr/local/ispconfig/interface/acme
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3787: EXECUTED: chown -R root:root /usr/local/ispconfig/server
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3791: EXECUTED: chown -R root:root /usr/local/ispconfig/security
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3795: EXECUTED: chown root:ispconfig /usr/local/ispconfig/security/security_settings.ini
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3797: EXECUTED: chown root:ispconfig /usr/local/ispconfig/security
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3799: EXECUTED: chown root:ispconfig /usr/local/ispconfig/security/ids.whitelist
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] -
Sat Jun 13 10:53:02 AM CEST 2026 - [ISPConfig] - /tmp/update_runner.sh.WIBGmSj5Ce/install/lib/installer_base.lib.php, Line 3894: EXECUTED: chmod +x /usr/local/ispconfig/server/scripts/create_daily_nginx_access_logs.sh /usr/local/ispconfig/server/scripts/create_jailkit_chroot.sh /usr/local/ispconfig/server/scripts/create_jailkit_programs.sh /usr/local/ispconfig/server/scripts/create_jailkit_user.sh /usr/local/ispconfig/server/scripts/generate_autoinstall_conf.sh /usr/local/ispconfig/server/scripts/ispconfig_update.sh /usr/local/ispconfig/server/scripts/letsencrypt_post_hook.sh /usr/local/ispconfig/server/scripts/letsencrypt_pre_hook.sh /usr/local/ispconfig/server/scripts/letsencrypt_renew_hook.sh /usr/local/ispconfig/server/scripts/run-getmail.sh /usr/local/ispconfig/server/scripts/update_from_dev.sh /usr/local/ispconfig/server/scripts/update_from_dev_stable.sh /usr/local/ispconfig/server/scripts/update_from_svn.sh /usr/local/ispconfig/server/scripts/update_runner.sh /usr/local/ispconfig/server/scripts/update_stable.sh
ro

 

Thank you for your reply.
If it is true that SquirrelMail is no longer suitable for Debian 12, which compatible version would you recommend installing—ideally a simple setup—to avoid breaking the existing system? Roundcube, or something else compatible with Debian 12?

 

Ok thanks you;
I would install RoundCube and let you know if there is anay issue