Did you had the following error lately trying to open a SSL Web site with Firefox? Error ssl_error_weak_server_ephemeral_dh_key This is because the remote Web server is using the weak SSLv3 protocol. The only way to get to the site would be disabling this SSLv3 check in Firefox. However do only if you know what you… Read More »
The following error may occur while reloading CSF (csf -r) : *WARNING* Binary location for [HOST] [/usr/bin/host] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable *WARNING* Missing or incorrect binary locations will break csf and lfd functionality In this particular case, CSF was installed on a CentOS 7 server and there… Read More »
You can get the SSL certificate informations of a local or remote site using the terminal and OpenSSL with the following command :
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echo quit | openssl s_client -connect domain.tld:443 |
Having such issue starting/stopping CSF on RHEL/CentOS 7? # csf -x *WARNING* URLGET set to use LWP but perl module is not installed, reverting to HTTP::Tiny You have an unresolved error when starting csf: Error: /sbin/ifconfig (ifconfig binary location) -v does not exist!, at line 2510 in /usr/sbin/csf You need to restart csf successfully to… Read More »
Here is how to open a port and make it permanent with the new firewalld on RedHat/CentOS Linux 7. You can statically edit /etc/firewalld/zones/zone.conf and reload the daemon, but the right way to do is the following. 1. Open the port by specifying the proper zone, port number and protocol. Unless you do not want… Read More »
Due to the recent POODLE (Padding Oracle On Downgraded Legacy Encryption) SSLv3 vulnerability discovery, you may want to disable it to protect you and your visitors against this exploit. Here is the procedure for Windows Server/IIS. Note that older/obsolete browsers are not implementing TLS, shame on users for not doing their updates then! 1. Open… Read More »
Have you recently noticed the following error message in /var/log/secure with RHEL/CentOS 6? PAM unable to dlopen(/lib64/security/pam_fprintd.so): /lib64/security/pam_fprintd.so: cannot open shared object file: No such file or directory PAM adding faulty module: /lib64/security/pam_fprintd.so There is several bug reports regarding this. I think PAM is trying to load an inexistant module. You should be concerned only… Read More »
Having problems connecting to your server with SSH and get this error messages in the system logs? sshd[0000]: input_userauth_request: invalid user <user> sshd[0000]: error: Could not get shadow information for <user> sshd[0000]: Failed password for invalid user <user> from 0.0.0.0 port 00000 ssh2 This mean you are missing “UsePAM” directive and/or the directive is set… Read More »
If you setup OpenVPN to be in bridge (layer2) mode instead using NAT/routing (layer3) and then restart the server to make the change effective, you probably noticed the following error message on the Status Overview page repeatedly : service failed to start due to unresolved dependencies: set([‘bridge’]) This is because there is no existing bridge… Read More »
Have you notified this error message in the logs since bind-9.8.2 update? named: validating @0x7fc170001550: dlv.isc.org SOA: got insecure response; parent indicates it should be secure named: error (insecurity proof failed) resolving ‘dlv.isc.org/DLV/IN’: 0.0.0.0#53 This is related to the new DNSSEC feature which is now enabled by default. This might indicate the DNS resolvers/forwarders you… Read More »