Saw an error in Internet Explorer 11 when I tried to connect to Oracle Enterprise Manager Database Express (EM Express) of Oracle 19c. Which means… Read More »How to Resolve Oracle 19c EM Express Not Working
Secure Sockets Layer (SSL)
When you access Oracle VM manager via browser, you may see SSL error like this: ERR_SSL_VERSION_OR_CIPHER_MISMATCH It's not because of your browser's security setting, it's… Read More »How to Resolve Browser Error When Connecting to Oracle VM Manager
Several sources provide IP blacklist free to download, you can leverage the blacklist to plan the blocking policies for your own firewall.http://myip.ms/files/blacklist/csf/latest_blacklist.txthttp://infiltrated.net/blacklistedAssuming that we have… Read More »How to Maintain Blacklist for IPTables Atomatically
When you were trying to use htdigest instead of htpasswd to create a password file, you might meet the error:[root@test ~]# htdigest -c /usr/local/httpd/passwords stevenCould… Read More »How to Resolve "Could not open passwd file -c for reading"
For creating SSL certificates, you have to install one of httpd module called mod_ssl, and after that, a corresponding configuration file will be created at /etc/httpd/conf.d/ssl.conf.[root@test… Read More »Where is the Default Location of SSL Certificates?
After installing SSL certificate, I rebooted the system, and I knew the process which ran httpd might be wrongly started at system startup, because starting… Read More »How to Resolve "(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80"
Openssl announced a vulnerability (CVE-2014-0160) in the handling of the TLS heartbeat extension on April 7th, 2014. Version 1.0.1 before 1.0.1g and 1.0.2 before 1.0.2… Read More »How to Update Openssl to a Fixed Release against HeartBleed on Enterprise Linux 6.4
After configuring SSL in httpd service, we can restart httpd.[root@w01 ~]# service httpd restartStopping httpd: … Read More »How to Remove Pass Phrase From Private Key
Before you create a self-signed certificate, you should install mod_ssl for Apache httpd server first. [root@test ~]# yum install mod_ssl Loaded plugins: fastestmirror, refresh-packagekit, security… Read More »How to Create Self-Signed Certificate by Openssl on CentOS 6.4