Hi,
After running "/var/ossec/bin/agent_control -l " there are several
servers/agents status is showing as "Disconnected".
Process I have followed to fix this:-
/var/ossec/bin/agent_control -l | grep Disconnected
output:- ID: 1042, Name: rungps-nightly.networkfleet.com, IP: any,
Disconnected
/var/ossec/bin/manage_agents -r <1042> # the id no in above output
This removes the key.
service ossec restart
then go to client:-
add key again
/var/ossec/bin/agent-auth -m 10.10.1.55
service ossec-hids restart
This solution is definitely working and fixing the issue. But, earlier I
had this issue for approx 10 agents. Now, I can see the same issue for few
more servers/agents. Even few servers reappeared even after fixing the
problem. Please help with some good solution..
Details about environment:-
******************************
OS = OEL Linux 6.8
/var/ossec/bin/ossec-analysisd -V
OSSEC HIDS v2.8 - Trend Micro Inc.
cat /etc/ossec-init.conf
DIRECTORY="/var/ossec/"
VERSION="v2.8"
DATE="Tue Jan 26 08:34:27 PST 2016"
TYPE=“server"
cat /var/ossec/etc/ossec.conf (Removed ip addresses)
<ossec_config>
<global>
<email_notification>yes</email_notification>
<email_to></email_to>
<smtp_server>localhost</smtp_server>
<email_from></email_from>
<email_maxperhour>25</email_maxperhour>
</global>
<syslog_output>
<server>xx.xx.xx.xx</server>
</syslog_output>
<rules>
<include>rules_config.xml</include>
<include>pam_rules.xml</include>
<include>sshd_rules.xml</include>
<include>telnetd_rules.xml</include>
<include>syslog_rules.xml</include>
<include>arpwatch_rules.xml</include>
<include>symantec-av_rules.xml</include>
<include>symantec-ws_rules.xml</include>
<include>pix_rules.xml</include>
<include>named_rules.xml</include>
<include>smbd_rules.xml</include>
<include>vsftpd_rules.xml</include>
<include>pure-ftpd_rules.xml</include>
<include>proftpd_rules.xml</include>
<include>ms_ftpd_rules.xml</include>
<include>ftpd_rules.xml</include>
<include>hordeimp_rules.xml</include>
<include>roundcube_rules.xml</include>
<include>wordpress_rules.xml</include>
<include>cimserver_rules.xml</include>
<include>vpopmail_rules.xml</include>
<include>vmpop3d_rules.xml</include>
<include>courier_rules.xml</include>
<include>web_rules.xml</include>
<include>web_appsec_rules.xml</include>
<include>apache_rules.xml</include>
<include>nginx_rules.xml</include>
<include>php_rules.xml</include>
<include>mysql_rules.xml</include>
<include>postgresql_rules.xml</include>
<include>ids_rules.xml</include>
<include>squid_rules.xml</include>
<include>firewall_rules.xml</include>
<include>cisco-ios_rules.xml</include>
<include>netscreenfw_rules.xml</include>
<include>sonicwall_rules.xml</include>
<include>postfix_rules.xml</include>
<include>sendmail_rules.xml</include>
<include>imapd_rules.xml</include>
<include>mailscanner_rules.xml</include>
<include>dovecot_rules.xml</include>
<include>ms-exchange_rules.xml</include>
<include>racoon_rules.xml</include>
<include>vpn_concentrator_rules.xml</include>
<include>spamd_rules.xml</include>
<include>msauth_rules.xml</include>
<include>mcafee_av_rules.xml</include>
<include>trend-osce_rules.xml</include>
<include>ms-se_rules.xml</include>
<!-- <include>policy_rules.xml</include> -->
<include>zeus_rules.xml</include>
<include>solaris_bsm_rules.xml</include>
<include>vmware_rules.xml</include>
<include>ms_dhcp_rules.xml</include>
<include>asterisk_rules.xml</include>
<include>ossec_rules.xml</include>
<include>attack_rules.xml</include>
<include>openbsd_rules.xml</include>
<include>clam_av_rules.xml</include>
<include>dropbear_rules.xml</include>
<include>local_rules.xml</include>
</rules>
<rootcheck>
<rootkit_files>/var/ossec/etc/shared/rootkit_files.txt</rootkit_files>
<rootkit_trojans>/var/ossec/etc/shared/rootkit_trojans.txt</rootkit_trojans>
<system_audit>/var/ossec/etc/shared/system_audit_rcl.txt</system_audit>
<system_audit>/var/ossec/etc/shared/cis_debian_linux_rcl.txt</system_audit>
<system_audit>/var/ossec/etc/shared/cis_rhel_linux_rcl.txt</system_audit>
<system_audit>/var/ossec/etc/shared/cis_rhel5_linux_rcl.txt</system_audit>
</rootcheck>
<global>
<white_list>xx.xx.xx.xx</white_list>
<white_list>^localhost.localdomain$</white_list>
<white_list>xx.xx.xx.xx</white_list>
<white_list>xx.xx.xx.xx</white_list>
</global>
<remote>
<connection>syslog</connection>
</remote>
<remote>
<connection>secure</connection>
</remote>
<alerts>
<log_alert_level>1</log_alert_level>
<email_alert_level>10</email_alert_level>
</alerts>
<command>
<name>host-deny</name>
<executable>host-deny.sh</executable>
<expect>srcip</expect>
<timeout_allowed>yes</timeout_allowed>
</command>
<command>
<name>firewall-drop</name>
<executable>firewall-drop.sh</executable>
<expect>srcip</expect>
<timeout_allowed>yes</timeout_allowed>
</command>
<command>
<name>disable-account</name>
<executable>disable-account.sh</executable>
<expect>user</expect>
<timeout_allowed>yes</timeout_allowed>
</command>
<command>
<name>restart-ossec</name>
<executable>restart-ossec.sh</executable>
<expect></expect>
</command>
<command>
<name>route-null</name>
<executable>route-null.sh</executable>
<expect>srcip</expect>
<timeout_allowed>yes</timeout_allowed>
</command>
<!-- Files to monitor (localfiles) -->
<localfile>
<log_format>syslog</log_format>
<location>/var/log/messages</location>
</localfile>
<localfile>
<log_format>syslog</log_format>
<location>/var/log/secure</location>
</localfile>
<localfile>
<log_format>apache</log_format>
<location>/var/log/httpd/*log</location>
</localfile>
<localfile>
<log_format>syslog</log_format>
<location>/var/log/maillog</location>
</localfile>
<localfile>
<log_format>command</log_format>
<command>df -h</command>
</localfile>
<localfile>
<log_format>full_command</log_format>
<command>netstat -tan |grep LISTEN |grep -v xx.xx.xx.xx | sort</command>
</localfile>
<localfile>
<log_format>full_command</log_format>
<command>last -n 5</command>
</localfile>
</ossec_config>
Regards
Prakash
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