If you’re using a VPN to unblock the blocked sites in schools, colleges, business places, etc then it can also cause the Resolving Host problem in Chrome. When the VPN is activated, the user’s real IP address is blocked, and instead some anonymous IP address is assigned which can create confusion for the network and it can block you from. Note: If you have an older version of Skype for Business or Lync, 16.0 should be listed as 15.0. Create a new DWORD 32-bit value called “DisableServerCheck” and set the “Data” to “1“. Now close out of the Registry Editor and give it a try. Skype For Business should work just fine now with OCS.

Skype For Business Mac Date Time Certificate Error Codes

NET::ERR_CERT_DATE_INVALID on Chrome warns about site’s expired SSL certificate

Contents

• NET::ERR_CERT_DATE_INVALID on Chrome warns about site’s expired SSL certificate
• How to Fix NET::ERR_CERT_DATE_INVALID Error? (Webmasters)
• Fix NET::ERR_CERT_DATE_INVALID Error on Google Chrome (Visitors guide)

NET::ERR_CERT_DATE_INVALID error is a warning message from Chrome browser which informs about expired website’s SSL certificate. The error comes with “Your connection is not private” message, suggesting that proceeding to such site is not a good idea. Websites that have no or expired SSL are considered insecure. While users can bypass this warning in a few clicks, we do not recommend doing so and fixing the matter properly. Whether you are a website owner or just a visitor, we have both cases covered in this easy tutorial.

You should never ignore NET::ERR_CERT_DATE_INVALID warning as it simply prevents you from possible dangers on the specified website. It can mean that any information you transmit to it can be read in open text, or there might be other dangers such as malicious downloads available.

However, the issue not always lies on the other end. Certain misconfigured settings on your computer, such as wrong time settings, can also trigger the error. We’ll cover all the methods to fix NET::ERR_CERT_DATE_INVALID in the guide below.

If you’re a webmaster, you might go to inspect page and encounter Failed to load resource: NET::ERR_CERT_DATE_INVALID. It is critical to fix such error immediately, as it prevents visitors from accessing your website. Moreover, it might create an untrustworthy image of your business or personal website.

It has been noticed that the issue often bothers those websites using LetsEncrypt, after renewing the license. Even though the SSL certificate is not expired, the error appears. To revert your website back to secure and fix SSL issues, follow the 2020 guide provided below.

Methods not to try

Some web resources might suggest you to apply unprofessional and insecure fixes that might seem to fix the problem. However, we want to warn you that such actions can have even worse consequences.

Some examples of things you SHOULD NOT try to fix NET ERR CERT DATE INVALID are listed below:

• DO NOT turn off or disable your antivirus or Windows Defender, or meddle with any security-related services. If you do so and enter a website that’s insecure, your computer can get infected immediately.
• DO NOT proceed to the said website, even if you think that it is safe to do so. Unless you’re a skilled IT professional who’s using a virtual machine or another secure environment, you shouldn’t play around sites that are marked as insecure. You might end up downloading malware such as STOP/DJVU or similar.

Check if the issue lies on your end

The first step that you should take is figure out whether NET::ERR_CERT_DATE_INVALID arises from an issue on your computer, or the website itself. Therefore, we recommend clicking on the error name as shown below, and seeing the date of website’s SSL certification expiration date.

Look at the Expires on line. If the date shown is earlier than current date, the SSL certificate is expired and therefore the website is to blame for showing the error for you. Proceeding to it might be dangerous.

If the certificate expiration date hasn’t come yet, it means that there might be issues with its configuration OR the problem lies on your end.

You also need to check the current date line. If it isn’t correct, it means the time settings on your computer are wrong and you need to fix it.

How to Fix NET::ERR_CERT_DATE_INVALID Error? (Webmasters)

Method 1. Renew expired SSL certificate

1. Purchase or renew current SSL certificate. Some hosting providers offer free SSLs, so you might want to contact your hosting provider and check on that. In addition, you can get free Cloudflare SSL if you’re using their DNS services.
2. You will need to validate your certificate either by email verification (you might receive a code) or by uploading a file to your website.
3. Install the SSL certificate on your website.

You can find more detailed instructions on SSL certificate providers’ websites.

Fix NET::ERR_CERT_DATE_INVALID Error on Google Chrome (Visitors guide)

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Method 1. Fix your computer’s time settings

The most common cause of NET::ERR_CERT_DATE_INVALID Error is wrong time and date settings on a computer. Here’s how you can fix it:

Windows

1. Right-click on Windows icon to open Settings. Here, go to Time & Language.
   
2. If the Set time automatically and set time zone automatically are turned off, turn them on.
   
3. However, if you can see that these settings are on but the issue persists, toggle these options off and then click Change under Set the date and time manually. Input correct information and click Change again.
   
4. Check if the issue persists. You should no longer see ERR CERT DATE INVALID Error in Google Chrome.

Mac

1. On Mac, click on Apple icon in the top left corner, and select System Preferences. Here, go to Date & Time.
2. You will need admin’s access to edit these settings, so click on the lock icon, enter administrator name and password to proceed.
   1. Automatically: Open Date & Time and then choose Set date and time automatically option. If required, choose network and time server for your region. Check if you can still see NET::ERR_CERT_DATE_INVALID in your browser.
   2. Manually: First of all, deselect the automatic date and time selection option. Then click on the current day in the calendar, enter current time and click Save.
3. Now, go to Time Zone, and adjust the time zone accordingly:
   1. Automatically: Click Set time zone automatically using current location.
   2. Manually: Deselect the automatic option, then click your location on the map, then click the Closest City pop-up menu, and choose a city that is closest to your location.

Skype For Business Mac Date Time Certificate Error List

The error now should be solved on your Mac.

Method 2. Test Google Chrome plugins

NET::ERR_CERT_DATE_INVALID Error on Chrome often occurs due to plugins and add-ons that can cause unwanted problems. To check if this is the case, you should first try connecting to your desired website via Incognito mode in Chrome.

Check if Google Chrome plugins are causing the issue:

1. While your browser is open, click Ctrl+Shft+N to open such window. Or you can click on three dots in the upper right corner and select New Incognito Window.
   
2. Enter the website’s name into the address bar and press Enter.

If you can access the website without seeing the error, it means that some plugins that are active in the normal Chrome browsing mode are to blame. Here’s what you need to do then.

Disable faulty Chrome plugins

You’ll need to play around with installed plugins a little to detect which one is causing the issue. Here’s what you need to do to fix ERR_CERT_DATE_INVALID:

1. Open Google Chrome and enter this line in the URL bar: chrome://extensions/, press Enter.
2. Here, toggle off (disable) one extension at a time. After disabling an extension, open a separate tab, and try connecting to the website that’s giving you the error message. Repeat until you find the extension to blame.
   

Method 3. Clear Google Chrome cache

Piled-up browser’s memory can be a reason why you can’t connect to a website due to NET::ERR_CERT_DATE_INVALID error. Here’s how to fix it by clearing the cache:

1. Open Chrome browser and click the three-dots in the upper-right corner. Click More tools > Clear browsing data.
2. Make sure you’re in the Basic tab. Select Time Range: All time, then tick all three options (browsing history, cookies and other site data, and cached images and files), then click Clear Data.
   
3. Check if the issue persists.

Method 4. Change your Internet connection

Sometimes Your Connection is Not Private – NET::ERR_CERT_DATE_INVALID occurs because you’re connected to insecure Wi-Fi or some other network. In such case, your browser is right. Therefore we recommend switching to another, secure connection and trying to connect to your desired domain again.

Method 5. Scan your computer with antivirus

One of the reasons why you might be encountering NET::ERR_CERT_DATE_INVALID error is malware present on your computer. Therefore, you need to detect and eliminate it as soon as possible. You can perform system scan and remove existing threats using antivirus you use, or download one now. Do not worry – there are both free and paid options to choose from. You can check some reviews here.

Method 6. Clear SSL cache

Clearing SSL cache can solve NET ERR CERT DATE INVALID error. It is a simple and easy method that you can try.

Skype For Business Mac Date Time Certificate Error

1. Press down Win+R keys at the same time to launch Run prompt.
2. In Run, type inetcpl.cpl and press Enter.
3. Go to Content tab.
4. Click Clear SSL state.
   
5. Click Apply and OK to finish.

Method 7. Reinstall Google Chrome

This is the last option you can try. To reinstall Google Chrome, do the following:

1. Simply go to Control Panel > Uninstall a Program, find and select Google Chrome and click Uninstall.
2. Follow directions on your screen. Once you’re done, go to the official download page and get the latest browser version.
3. Click on the download to launch the installation wizard, and follow directions on your screen.

That’s it! We hope that our provided methods helped you to fix NET::ERR_CERT_DATE_INVALID on Google Chrome. If you have discovered another method, please share it with us in the comments section below.

Norbert Webb is the head of Geek’s Advice team. He is the chief editor of the website who controls the quality of content published. The man also loves reading cybersecurity news, testing new software and sharing his insights on them. Norbert says that following his passion for information technology was one of the best decisions he has ever made. “I don’t feel like working while I’m doing something I love.” However, the geek has other interests, such as snowboarding and traveling.

Skype For Business Mac Certificate Error

Scoping the problem

Let's assume that you want to troubleshoot issues that occur when users try to join a Skype for Business Online (formerly Lync Online) meeting by using Lync 2010, Lync 2013, the Lync for Windows Store app, or Lync for Mac 2011. Before you start, ask yourself and any external users who are experiencing the issue the following questions:

• How many users does the problem affect?
• Are the users internal or external to your organization?
• Can the affected users reproduce the problem on a single computer or on multiple computers?

When you have the answers to these questions, see the following table to determine the kind of issue that you're dealing with. This table is provided to help scope the problem to a certain category. However, some categories may be outside the technical support boundaries of a Skype for Business Online support engineer.

Read the table as in the following example:

Multiple users... (but not a single user) ...from outside our organization...Can't join a Skype for Business Online meeting from multiple computers: (is usually caused by) Lync federation issue or external network issue.

Be aware that each column and each row are mutually exclusive. That is, the issue affects either a single user or multiple users, and the issue can be reproduced either on one computer or on multiple computers.

Problem

Note

If you don't experience one of the symptoms that are listed in the following table, use the scoping table in the 'Scope' section to narrow the problem to a specific kind of issue. Then, you can troubleshoot the issue by following the steps that are outlined here.

Troubleshooting Windows client issues

To resolve any client or computer issue, first make sure that the computer is up to date. The computer should have the latest operating system updates, audio and video drivers, and software application updates to make connecting to a Skype for Business Online meeting a successful experience. To do this, follow these steps:

1. Run Windows Update, and then verify that all optional hardware updates are installed. Specifically, make sure that video, audio, and network drivers are up to date.

2. Verify that Lync is up to date. See Lync Downloads and Updates for the latest Lync updates.

   Select your version (2013 or 2010), and then select Lync client under Category.

Now that the computer is up to date and meets all minimum system requirements, clear any cached credentials or certificates from previous logons:

1. Verify that the user has the correct certificates in Certificate Manager. To do this, follow these steps:

   1. Open Windows Certificate Manager. To do this, click Start, click Run, type certmgr.msc, and then click OK.
   2. Expand Personal, and then expand Certificates.
   3. Sort by the IssuedBy column, and then look for a certificate that is issued by Communications Server.
   4. Verify that the certificate is present and that it isn't expired.
   5. Delete the certificate, and then try to sign in to Skype for Business Online. If you can't sign in to Skype for Business Online, go to step 2.

2. Remove the user's Skype for Business Online credentials from the Windows Credential Manager. To do this, follow these steps:

   1. Click Start, click Control Panel, and then click Credential Manager.
   2. Locate the set of credentials that are used to connect to Skype for Business Online.
   3. Expand the set of credentials, and then click Remove from Vault.
   4. Try to sign in to Skype for Business Online, and then type the new set of credentials.

Skype For Business Mac Date Time Certificate Error Number

Skype for Business Online falls back to 'anonymous join' if it can't authenticate. As long as anonymous participants aren't explicitly blocked from joining the meeting, they should always be able to join the meeting.

Troubleshooting network issues

1. Verify that the computer is connected to the network. Determine whether the computer can access other websites.
2. Verify that the network meets the requirements for connecting to Skype for Business Online. For more information, see You can't connect to Skype for Business Online, or certain features don't work, because an on-premises firewall blocks the connection .

Fixing OCSMEET file associations in Windows

1. Verify that Skype for Business Online is the default program that is used to open .ocsmeet files. To do this, follow these steps:

   1. Click Start, click Control Panel, and then click Default Programs.
   2. Click Associate a file type or protocol with a program.
   3. Scroll down to .ocsmeet, and then verify that **Microsoft Lync **is selected as the Current Default option.

2. If step 1 doesn't resolve the issue, perform an Repair an Office application, or reinstall Lync 2010.

Troubleshooting Identity issues

This specific issue occurs when two users of the same Office 365 organization share the same user name (alias). Because of how Lync generates meeting URLs, two users on the same Office 365 organization who have the same user name will share the same meeting URLs. This causes the Skype for Business Online conference to become corrupted.

To resolve this issue, change the user name of one of the users who has the duplicate user name.

Troubleshooting Lync federation issues

If external users (and only external users) can't join a Skype for Business Online meeting, first determine whether they're trying to join as authenticated users or as anonymous users.

• If the user is trying to join as an authenticated user from another Lync or OCS organization:
  • Your Skype for Business Online organization must have External Communications enabled, and external communication must be completely open. Or, the external user's domain must be in the Allow list.
  • The external organization must have federation configured correctly from their side, too.
  • For more information about federating with a Skype for Business Online organization, go to the following Microsoft TechNet website: Configuring Federation support for a Skype for Business Online customer
  • If authenticated join doesn't work, Lync should automatically try to join as an anonymous or guest user.
• If the user is trying to join as an anonymous user from Lync Attendee, or if the Lync Web App or is dialing in to a Skype for Business Online conference with an ACP access number:
  • For anonymous join to work, a specific DNS SRV record must be present in DNS.
  • For various methods of confirming your Skype for Business Online DNS records, see Troubleshooting Skype for Business Online DNS configuration issues in Office 365.

Joining meetings by using the Lync Web App

If these troubleshooting steps don't resolve the issue, and if joining the meeting immediately is a bigger concern, use the Lync Web App. Be aware that the Lync Web App doesn't include Voice over IP (VoIP) functionality. That means that participants can only view sharing sessions. To do this, follow these steps:

1. Copy the Join URL from the meeting invite, and then paste it into Internet Explorer. (Warning: Don't press Enter yet.)

2. Add '?sl=1' to the end of the URL, and then press Enter.

   Note

   You must have Silverlight installed to use the advanced features of the Lync Web App.

Troubleshooting issues with third-party software

If you're using third-party software, you may be asked to update, disable, or remove the software as a troubleshooting step. If the issue is resolved after you take one of these actions, you may be referred to the third-party manufacturer for more help or to perform additional troubleshooting.

Still need help? Go to Microsoft Community.