Strangely your /etc/webmin/webmin.acl file is missing
1st: try finding the file first.
2nd: if not found, try redefining the users that have access to webmin and the modules they can use, from inside webmin (if you can access webmin now without that file!)
3rd: if you can't do the above, then try creating the file and adding inside something like:
Code:
root: acl adsl-client apache at backup-config bandwidth bind8 burner cfengine change-user cluster-copy cluster-cron cluster-passwd cluster-shell cluster-software cluster-useradmin cluster-usermin cluster-webmin cpan cron custom dfsadmin dhcpd dnsadmin dovecot exports fdisk fetchmail file firewall frox fsdump grub heartbeat htaccess-htpasswd idmapd inetd init inittab ipfilter ipfw ipsec jabber krb5 ldap-client ldap-useradmin lilo logrotate lpadmin lvm mailboxes mailcap majordomo man mon mount mysql net nis openslp pam pap passwd postfix postgresql ppp-client pptp-client pptp-server proc procmail proftpd pserver qmailadmin quota raid samba sarg sendmail sentry servers shell shorewall smart-status smf software spam squid sshd status stunnel syslog-ng syslog telnet time tunnel updown useradmin usermin vgetty webalizer webmin webminlog wuftpd xinetd
Luckily you'll have root access (not recommended), then add users to webmin, and modules for them to access.
4th: If non of the above worked, no other option than reinstalling webmin, as far as I know or remember.
Post back results if you can. Good Luck.
EDITED: corrected some mispells.
