Plesk Key Install Problem

[GlobalServe]

Running Plesk 8.6.x

ERROR: PleskFatalException
Up LevelUp Level
keymng::install() failed: keymng failed: /opt/psa/admin/bin/httpsdctl execution failed:
/opt/psa/admin/bin/httpsdctl: line 104: 10587 Segmentation fault $HTTPD -t
fatal error: Plesk graceful restart failed

0: /opt/psa/admin/plib/common_func.php3:190
psaerror(string 'keymng::install() failed: keymng failed: /opt/psa/admin/bin/httpsdctl execution failed: /opt/psa/admin/bin/httpsdctl: line 104: 10587 Segmentation fault $HTTPD -t fatal error: Plesk graceful restart failed')
1: /opt/psa/admin/htdocs/server/key_upload.php:112

 

[GlobalServe]

I think i found the problem. The linux distro was upgraded to Debian 5.x

When will there be debian 5 support?
How is it possible to revert?