How to Fix “HTTP/1.1 Service Unavailable” Error on Windows?

The HTTP.1.1 Service Unavailable error message is also known as the HTTP status code. There are various status codes encountered by the users with a particular number and equivalent meaning. Some users are reportedly getting the “http/1.1 service unavailable” error when they try to visit particular websites or access the Unified Gateway logon page. This happens because the service and file which is invited on the internet are unavailable at that time.

Http/1.1 Service Unavailable
Http/1.1 Service Unavailable error

And due to this, your devices like PC, tablet, or mobile are unable to connect properly with the particular website’s backend at that moment. Well, you may get connected with it in the future but are unable to access it at a particular time and therefore start seeing the error message on your screen.

After investigating the particular error, we find out there are many different reasons that trigger the error message on your screen. So, before heading towards the fixes, it is important to understand the common causes responsible for the HTTP 1.1 Not Available:

  • Poor Internet connection: One of the most common reasons, behind the error, is the poor or limited bandwidth. And if your internet is not configured properly, you are more likely to get the error on your screen when accessing a website. So, check for your internet connection speed or connect to a different connection.
  • Website Backend Problems: Another possible reason for the error is the backend problem with the themes or the plugins used on the particular website. This may prevent the request for reloading the webpage and displays the status code error on the screen. In this case, the problem will be fixed by the website’s admin.
  • Outdated or Corrupted Browser: If you are running an outdated or corrupted browser then this can cause issues and be unable to function properly. Sometimes the outdated browsers start functioning slow and are unable to access particular websites. So, check for the latest updates available or reinstall the updated browser version.
  • Windows Add-Ons: If by default Windows has enabled some Add-ons, then this might be conflicting with the website while loading and prevent it from loading. So, make sure to disable the add-ons on your Windows system and fix the error.
  • Corrupted Cache: The browsers store cache on the hard disk to speed up the website loading process on the web. But sometimes the stored cache gets corrupted and starts causing issues. So, clearing the temp files and corrupted cache may solve the error for you.
  • DNS Issue: If your Windows default DNS server is down then the internet connection may not work properly and unable to access some websites. You can modify the DNS server to fix the error.
  • Low Disk Space: In some serious circumstances you start seeing the error due to the low disk space or your system is running out of space and this may prevent the webpage from loading. In this case, clearing the disk space fixes the problem for you
  • Unusual Resources: It is not uncommon to start facing the error when the web page you are accessing is low on resources and the traffic has exceeded the online users of that particular website on your system. You can resolve the error sometimes easily by refreshing the website. But to fix it permanently the website owner needs to upgrade the server.

As you are now familiar with every possible culprit responsible for the error. Let’s try some of the workable solutions used by other affected users to successfully get to the bottom of the error and fix it completely.

Preliminary Basic Fixes

Before starting with other essential fixes here it is suggested to start following the quick tweaks as this works for you to solve minor glitches and bugs responsible for the error.

Reboot your Devices – Very first it is suggested to reboot your devices, sometime a simple restart solves the internal glitches and bugs that cause the error. So, first, disconnect your PC or laptop from the internet and switch off the router.

And switch off your system completely, wait for 5 minutes at least and turn ON all the devices. Once your system boots, visit the problematic website and see if the error is fixed.

Refresh your Browser – Many times refreshing the browser solves glitches and issues. So, refresh your browser by pressing the CTRL + R icon and try visiting the webpage again. If still see the error then close your browser completely and wait for 2-3 minutes. Now relaunch your browsers and check if the issue is fixed.

Moreover, if still getting the error message, then accessing the page on another browser makes works for you to solve the error.

Try Accessing the Unified Gateway Page

You might be getting the error due to the reachability problem from the Netscaler to the Storefront server, So, in this case, accessing the unified gateway page and adding the storefront server as a service works for you.

Follow the instructions to do so:

  1. First, try adding a storefront server as a service. And then connect the monitors such as ICMP or TCP defaults to examine if there is any connectivity problem or some sort of port problem.
  2. Now allow the 443 ports for storefront IP via the firewall.
  3. After doing so, open the storefront settings and verify you are not facing any 443 port mismatched issues in the Unified Gateway configuration.
  4. Check if the below-given expression piece is missing from the storefront store name, then add the “REQ.URL.PATH.SET_TEXT_MODE(IGNORECASE).STARTSWITH(“/Citrix/STORE_NAME” line, into the content switch policy.
  5. Now try to access the unified gateway page

And check if the http/1.1 service unavailable error has been fixed, but if not then follow the next solution.

Check your Internet Connection

Most of the time the service unavailable error appears because of a poor or a bad internet connection. Just check whether your internet has proper bandwidth. Sometimes internet speed varies from area to area and it may have gone temporarily down. So, contact the internet service provider or you can also try troubleshooting the internet.

Follow the instructions given to follow the steps:

  1. Move towards the bottom right of your screen where you will see a Network Button or a WiFi button and right-click on it.
  2. Choose the option Troubleshooting Problems from the menu provided. And the Windows Network Diagnostic Service will search for the network connectivity issues.
    Choose the option Troubleshooting Problems
  3. Then follow the instructions displayed on the screen to continue the troubleshooting process
  4. Once the entire troubleshooting process is completed, just try to access the website and check if the error appears.

Check your Device Date & Time

If your device date and time is set wrong then this can be a culprit that causes the error. You just need to change the date and time of your system.

Follow the steps mentioned to reset the date and time:

  1. Move to the right bottom of your screen. On the date-time option, right-click.
  2. From the menu opened, select Adjust Date/Time and the setting page will appear.
    Open Adjust Date/Time
  3. Click on the toggle button next to Set time automatically and Set time zone automatically On, option
  4. If somehow, after doing step the time shown is still incorrect, turn off both the toggle buttons.
  5. You will notice there will be a Change Option, below the Set date and time manually
    Http/1.1 Service Unavailable
    Choose Set date and time manually option
  6. And click on it to Set the correct standard time and date.
  7. Find the time zone you are living in currently and select it.

After this whole process has been completed it is estimated the error is resolved but if not then head to the next potential fix.

Clear the SSL State

As some users have reported that clearing the SSL state in the internet properties worked for them to fix HTTP.1.1 Service Unavailable error. There is a possibility that your SSL state gets corrupted and causes an SSL connection error or conflicts when sending a request to the server and clearing it may work in your case.

Follow the instructions to do so:

  1. Open Run prompt by clicking Windows + R And in the Run box type “inetcpl.cpl” and hit Enter.
    Type inetcpl.cpl command
  2. At the top, select the Content Tab and click on the “Clear SSL State” option
    Http/1.1 Service Unavailable
    Click on the Clear SSL State option
  3. Now your screen will show a pop-up message, saying that the SSL state has been cleared successfully.

Reset to the Original Settings

If you have done any modification in the original settings of your internet options then this might be a reason why you are unable to visit the website and get the error message on your screen. So, try to reset to the original settings.

Follow the steps to do so:

  1. Open Run box by clicking on Windows + R keys and in the run box type “inetcpl.cpl” and hit Enter. An Internet options screen will get launched.
    Type inetcpl.cpl command
  2. At the top, there will be an Advanced option. Just click on it and then you need to click the Reset button.
    Http/1.1 Service Unavailable
    Reset Internet options
  3. You will get a popup on the screen, where you will need to press confirm button
  4. After doing this, just check whether your issue has been resolved or not or follow the next possible solutions.

Clear Cache and Temporary Files

Sometimes cache and temporary files get corrupted and lead to various errors. So, there is a possibility clearing all the cache files and temporary files fix the HTTP status code.

Here follow the instructions to clear the cache on the Chrome browsers: 

  1. First, open the chrome web browser and then navigate to the “Three Dots” which you can see on the top of the computer screen.
  2. Now, click on the More tool option and click on the Clear Browsing
    Open Clear Browsing Data in the Chrome Menu
  3. After that check cookies and cache data and then click on the Clear Data 
    Clear the Browsing Data of Chrome
  4. Restart your browser and PC

Hope the error on the Chrome browser is fixed. Well, these are the steps for the Google Chrome browser and if you are using different browsers like Firefox or Edge then make sure to clear cache and temporary data on your Windows browsers as this may work for you.

Update Your Browser

Whenever you get a new update for an application, and you are still on its old version, new features won’t support and more importantly these old versions will start giving errors with some websites. So, check for the latest update available on your browsers and install it.

Follow the instruction given:

  1. Open the Chrome browser. Now move to the extreme right-hand side corner. You will notice three dots above and click on them.
  2. From the drop-down menu select Settings. Another page will be opened. Move to the About Chrome option, present on the left side.
    Open the Chrome Settings
  3. After selecting this option, an update check will be automatically prompted by Chrome.
  4. As the update check is over, and any new updates are available then click on Update Button. The latest update will be downloaded and will get installed.
    Update Chrome
  5. Once your browser gets updated, check whether you are still getting the error message or not.
  6. If you are using any other browsers, other than Chrome, similarly update the browser and check whether the error message is resolved or not.

Disable Windows Add-Ons

Another possible reason responsible for this server unavailable error is because some Add-Ons have been enabled by Windows on the internet connection. And these add-ons might be preventing the website from sending requesting and reloading.

Also disabling the add-ons worked for many users to get past the error. So, follow the steps given to do so:

  1. Open Run Prompt by clicking on Windows + R and here type “inetcpl.cpl” and hit Enter. An Internet options screen will get launched.
  2. At the top, a Programs tab will be present click on it. A next screen will open where you have to select the option “Manage Add-Ons”
    Http/1.1 Service Unavailable
    Click on Manage Add-Ons
  3. A drop-down option will be present below the heading “Show”. Open it and select the “All Add_Ons” option.
  4. For each of the Add-Ons present there, right-click on them and proceed to Disable option.
  5. After disabling all the add-ons, press the close option. Press on Apply option and click on OK. Now see if the http/1.1 server certificate error has been fixed or not.

Scan for Malware

If your system is infected with a virus or malware infection then this might prevent you from visiting the particular website and as a result, you see the error message on your screen. So, if you are using a third-party antivirus program then perform a deep scan to remove the virus or malware infection.

Moreover, you can also scan your Windows 10 system with the inbuilt Windows defender tool. Here follow the steps to run the tool manually.

  1. Press Windows + I key to open Settings of your PC,
  2. Then move to Update and Security and click on it.
    Update and security
  3. After opening you will see a Windows Defender option.
  4. Open it and then scroll to the bottom, and select the checkbox “Windows Defender Offline Scan
    Use Windows Defender Offline Scanner
  5. Now proceed with Scan Now option.

Once the scanning process is finished restart your system and revisit the web page to see if the error persists or is fixed or follow the next possible fix.

Use a Proxy Server

In this method, it is suggested to unblock the proxy server in your PC internet connection LAN settings. Using the proxy server might solve reachability issues and you can access the Unified Gateway logon page.

Follow the given below instructions to do so:

  1. First, open the Run box to do this click on the Windows + R button and then in the Run box type “inetcpl.cpl” and hit the Enter key
  2. Now click on the Connections button and then click on the “LAN Settings”
    Accessing the LAN settings menu
  3. Unclick the check box next to “Use a Proxy Server” and then save all the settings.
Click on the Use a Proxy server option

After completing the process click on the OK button to close all the tabs. Now check the error message still exists or not.

Clear DNS Cache

Many a time due to an issue in DNS of client-side, http/1.1 service unavailable error may come up. In these scenarios, the local DNS cache memory needs to be cleared first. After this IP address of your, Windows needs to be released and relaunched.

So, follow the below steps to clear DNS.

  1. Press the Windows + key and in the Run box that appeared type cmd and hit Enter
  2. Now the Command Prompt window is launched
  3. In the command prompt type the command Ipconfig/flushdns and hit Enter
    Type “ipconfig /flushdns” into the Command Prompt
  4. After this action, your DNS cache will be completely cleared.
  5. Now visit the web page to see whether the http/1.1 service unavailable error persists or is been resolved.

Change the DNS Server

If you still encounter the error then you can change the DNS server address. Sometimes the DNS configured on your PC is not owned by Google, which takes a long time to load the page and can cause errors.

Here are the following step by step instructions to change the DNS server:

  1. First, click the “WinR” key together to open the run command, and in the text box type “ncpa.cpl” and hit the “Enter” button. After that network management window will get opened.
    Opening Networking Settings in Control Panel
  2. Here you have to click on your Wi-Fi connection option and then select “Properties”.
  3. Now, double-click on “Internet Protocol Version 4 (IPV4)” and then check on the “Use the Following DNS addresses” option.
    Accessing the Internet Protocol Version 4 settings
  4. Here in the space, you can enter the DNS address. So, enter the following DNS primary & secondary addresses in the given space available.
  5. Hit on the OK button and exit from the window.
  6. Now, your DNS address is changed, so check the error is solved or not.

Allow Exception to the Windows Firewall

There is a possibility that your Windows Firewall is blocking the connection and due to this you are unable to access a particular website or block the request.  And it is not uncommon for the Firewall to block access to the internet. So, add your browsers to the whitelist to prevent seeing the error.

Follow the steps to allow Firewall on your browser:

  1. Press Windows + I key to open Settings.
  2. There will be an option of “Update and Security” click on it.
  3. Go to Windows Security then move to Firewall and Network Protection. After that proceed to Allow an app through the firewall option.
    Allowing an app through Windows Firewall
  4. Click on the “Allow another app” popup option that appears on the screen to enable permissions for admin after clicking on the “Change Settings
    Allowing another app to the list of allowed items
  5. And click on the “browse” option. In that, you have to find and select your browser.
  6. Then click the option “Add”. By this, the selected browser will get added to Firewall’s excluded list.

After doing these, just go to the main web page and check whether the HTTP 1.1 not available error has got resolved.

Perform the Disk Cleanup

Well, this fix is less applicable, but in some cases, it is seen if you are running low on space then this can cause errors. So, check your system space and if you are running low on disk space on your system then this might be causing issues when loading a webpage.

So, try clearing the temporary internet files by performing disk cleanup. If this is applicable in your case then follow the instructions to do so:

  1. Open File Explorer by pressing Windows + E
  2. And on Local C Disk right click and choose the Properties option
  3. Go to General and click on Disk Cleanup
    Disk cleanup – Windows Drive
  4. After doing this, Windows will automatically start looking for any temporary and unwanted files on your PC.
  5. Next from the appeared results, you need to select “temporary internet files” and “recycle bin.
    Running Disk Cleanup
  6. And click on OK to close the window.

So, it is estimated the above-listed solutions work for you to solve the http/1.1 service unavailable on your Windows system.


Hardeep Kaur

Hardeep is a passionate technical writer with more than 7 years of experience. She has a keen interest in PC games, Windows OS and everything surrounding it. She is a technology enthusiast and fascinated with technology since her childhood days.