- Server operating system version
- CloudLinux 7.9
- Plesk version and microupdate number
- 18.0.51.1
Hello
The issue appears on its own since introduction of the latest version 18.0.51 we have been getting these cases related to litespeed and roundcube, we tried checking if the issue is related to CageFS but it does not appear to happen due to that.
Swtiching to apache resolves the issue but at the same time server will suffer from higher load at some point of the day.
```
17-May-2023 10:51:04 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:04 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:05 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:06 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:06 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
```
The issue appears on its own since introduction of the latest version 18.0.51 we have been getting these cases related to litespeed and roundcube, we tried checking if the issue is related to CageFS but it does not appear to happen due to that.
Swtiching to apache resolves the issue but at the same time server will suffer from higher load at some point of the day.
```
17-May-2023 10:51:04 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:04 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:05 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:06 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
[17-May-2023 10:51:06 UTC] PHP Fatal error: Call to undefined function mb_internal_encoding() in /usr/share/psa-roundcube/program/lib/Roundcube/bootstrap.php on line 86
```