The Security Certificate has Expired or is not yet Valid - Reason and Solution

Security certificate is an important way to find a website is genuine and trusted. At the e-commerce age, any website without proper security certificates cannot be trusted because security certificate includes website identification and trust level. This tutorial explains a situation where you get the error message "The security certificate has expired or is not yet valid" while trying to access secure web pages from your computer. Some times you may get different but similar type error messages for the same issue like Secure Connection Failed. This can happen due to multiple reasons and some of them are listed below.
  1. Domain uses an invalid security certificate

  2. Connection between website and your PC is untrusted

  3. The security certificate has expired or not yet validated

  4. Different time set on your computer and server

Examination of security Certificates Errors

When your computer finds the website is no longer trusted by examining the certificate, it will show you any one of the messages below.

Another common error message is "Secure Connection failed" and it looks like in the image below.

Now it is the time to troubleshoot the issue and fix. Here I have prepared a process and it would be fine if you follow it when you see any security certificates error messages on your browser. If you are getting this warning for a single website only, you can conclude the issue is with the website. Otherwise, you may have to check your PC too.

  1. check the system date

    In my experience most of the users get the error message due to the wrong time set on their PC. If you receive any connection untrusted error message, at first check the system date on your computer. If the system date is wrong, you must correct it to the exact time. After correcting the time related issues, try to access the secure website.

  2. Change Browser

    If you face the issue with Firefox, try to open the same website on another browser.

  3. Change Browser security preference

    High security preference set on a web browser can also display error while you try to access a secure web page. Set lower security level on your browser and check for the issue. If you can visit the secure website after changing the security level, you may either keep the same settings or try to update the browser.

  4. Browser and OS update

    By keeping the Operating System and browser updated, you can avoid most of the issues like this.

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How to Perform Port Forwarding in BSNL Modem

BSNL supplies modem with default firewall which prevents traffic through uncommon ports to ensure the security of devices connected to it. Sometimes it can be annoying because certain applications need some of these ports to work properly and the firewall settings prevent these applications from running properly. Port forwarding requires to fix issues with playing online games, online conferences or messaging, establishing a VPN connection through the BSNL modem. If you have installed online camera on your network, you may need to open certain ports to it access through Internet. Port forwarding for certain applications are already defined on BSNL modem and all you have to do is just enable them. For other applications you should make sure you have the correct port number and the protocol type (UDP/ TCP) before starting the process. You can get this number either from the specific product manual or from their technical support.

Steps to Open a Port On BSNL Modem
  1. Login

    Type on the address bar of the browser and enter the following details when it prompts.

    User Name: admin
    Password : admin

    To learn more about it, visit the link below.
    How to Configure BSNL Teracom Modem

  2. Click on Security tab

    The option port forwarding is under Security tab.
    Open Age of Empires through BSNL

  3. Click on Port Forwarding

    It may prompt you to enter BSNL modem username and password to continue the process.
    Exception rule

  4. Click on Add

  5. Add a new Port Forwarding Rule

    You must specify which Port you want to open on BSNL Firewall.
    Angry birds bsnl

    Here you can select the specific application from the list of pre-defined rules. If you cannot find your application in this list, you can select user defined option to open a port for your application. For that you should have the port number and protocol type from the product vendor. After creating the rule, you have to click on "Apply".

  6. Reboot

    Under admin tab you can find reboot option. You should select "reboot from last" option. Some times you may need to reboot your modem to take the port forward rule in effect.

After rebooting the device, you might check whether the application is working properly. If not, you might need to make the computer as DMZ to stop all firewall restrictions. To do this, follow the instructions provided in the link below.
How to Make DMZ

Further Reading
  1. Setup wireless and security in Teracom Modem

  2. UT Starcom ADSL Configuration

  3. Setup Wireless Security On  Teracom Network

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