If you get an Error Code 15 or Error Code 16 while you are browsing the web and you notice that your access is blocked to a particular website, then read on as this post will guide you in resolving this problem. Both Error Code 15 and Error Code 16 have the same message that states, “Access Denied: This request was blocked by the security rules”.
Note that the error depends on what kind of browser you are using, as well as the operating system and network that you are using. On the other hand, the fixes for this error are the same and there is a handful of them that you can check out just make sure to follow each one of them carefully.
The first thing you can try is to sync the Date and Time of your computer as the wrong Date and Time settings are one of the most common causes of connection problems like Error code 15 or Error code 16. This is because of the incompatibility between the SSL Certificate validation date and the System Clock. Thus, you have to sync your System Clock. Refer to the steps below to do so.
Resetting the affected browser might help in fixing Error Code 15 or Error Code 16.
Firewall and antivirus programs are known to block files the instant it detects a threat to the system. However, there are some cases when it can also block a file even when it’s a safe one. Thus, your antivirus or firewall programs might be the reason why you can’t download anything on your Windows 10 computer. To isolate the issue, you need to temporarily disable both the Firewall and antivirus programs and then check if you can now download anything from the internet. Do not forget to enable them again as disabling them can leave your computer vulnerable to cyber threats.
You can also try to disable the Proxy server for your LAN to fix Error code 15 or Error code 16 especially if your computer was attacked by some malware or adware recently. In such cases, there is a chance that the malware or adware has changed your network settings in order to generate intrusive advertisements. Thus, you have to disable the proxy server and you can do that by following these steps:
Note: If you are using a third-party proxy service, you have to disable it.
If you are using a VPN application, there are times when it causes some issues like this error. If that’s the case, you can try to disable your VPN temporarily and see if the error is resolved or not and if turns out that your VPN is the culprit, you have to uninstall it and install a new one or its latest version. To uninstall it, follow the steps below.

Many times we were talking and writing here on Errortools.com about security, privacy, hacking, identity theft, etc. We tried to raise important security questions and I hope I have managed to at least shed some light and change maybe some bad behaviors for some, helping them embrace better routines about their security on their PC.
In this light, I will today present you with one neat and awesome piece of software, a password manager worth your time and money (if you want premium features): BitWarden.
Error Causes"Error 1723- There is a problem with this Windows Installer package. A DLL required for this install could not be run. Contact your support personnel or package vendor...”You are most likely to come across the error code 1723 if the Java installation is not completed successfully. In other words, the error indicates that the installation process has failed.
Error Causes“Error 1005 Access Denied – The owner of this website has banned the autonomous system number (ASN) your IP address from accessing this website.”Usually, this error occurs when the website administrator decides to block an IP address or IP range. To fix this error, here are some suggestions you can try:
Customers will most likely encounter the “We couldn’t update system reserved partition” error when upgrading to Windows 10 from Windows 7 or Windows 8.1. This error may also come with error code 0xc1900104 or error code 0x800f0922.
Error Cause“We couldn’t update system reserved partition” Windows 10 upgrade error is normally caused by too little space on the System Reserved Partition (SRP). The System Reserve Partition is an additional small partition created by Windows, which stores boot files. The SRP can be filled up with security apps and third-party anti-virus. Once this partition has insufficient space, the system will not be able to upgrade to Windows 10.
Caution: The following steps are complex and need to be done by experienced users especially using the command line. Once an error is made in entering commands, there’s a chance that your device can be put in a no-boot situation, or data stored on the device can possibly get lost.
To upgrade to Windows 10, your device needs to have at least 15MB free space on the System Reserved Partition. Follow the procedure below and then try upgrading again.
NOTE: While in Admin mode, some apps like OneNote will not run.
Doing this method will make a permanent, but small increase in the free space of the device’s SRP.
a. Open the Run window by pressing the Windows key + R. Type diskmgmt.msc then hit Enter. b. Select System Reserve partition then right-click on it.
c. Choose Change Drive Letter and Paths then select Add.
d. Type Y for the drive letter then click OK.
e. Click on the Start button and search for cmd. In the results, right-click on Command Prompt then choose Run as administrator. The command prompt window will appear.
f. Type Y: at the command prompt then press Enter.
g. Once you’ve switched to drive Y, type takeown /d y /r /f . then hit Enter.
NOTE: Ensure that the space and period after “f” is included in order for the command to work properlyh. Type icacls Y:* /save %systemdrive%NTFSp.txt /c /t then hit Enter to back up the permission to the drive.
NOTE: Ensure that all files are marked as successful and that no files are marked as failed.
i. Type whoami then hit Enter. Record the username that appears. Afterwards, type icacls . /grant <username you got from whoami>:F /t then press Enter.
NOTE: Ensure that there’s no space between the username and “:F” or the command will not work.j. In the File Explorer, open the SRP drive and select the Boot folder. Choose the language folders you want to permanently delete. Language folders are named with four letters split with a hyphen. For example: de-DE is the German language while en-US is the U.S. English language.
2. Truncate the NTFS Log:
a. Open the Command Prompt then type chkdsk /L Y: to check the size of the NTFS Log. If the NTFS Log size is less than 5000KB, you need not truncate the file.
b. Type chkdsk /L:5000 /X /F then hit Enter to truncate the NTFS Log.
c. Return to Disk Management window. Select Action menu then select Check if the device’s SRP now has a larger amount of free space. Once there’s enough space, right click the System Reserve Partition then select Change Drive Letter and Paths. Choose Y: then select Remove.
3. If there’s still not enough available space after truncating the NTFS Log, resize the USN journal:
a. Open the command prompt then type fsutil usn queryjournal Y: to display the size in hex value. Convert the hex value to decimal then divide it by 1048576. The result you will get will be in MB. If the journal size is 30MB or more, proceed with truncating the file.
NOTE: To convert the Hex value to Decimal, open the Calculator app in Windows then choose View menu. Select Programmer then choose Hex. Type the Hex value then choose Dec.
b. Type fsutil usn deletejournal /D /N Y: then hit Enter to delete the journal. Type fsutil usn createjournal m=1500 a=1 Y: to recreate the journal having the new log size value.
a. Type icacls Y: /restore %systemdrive%NTFSp.txt /c /t in the Command Prompt. Check if the files were successfully processed before proceeding. If you see a message saying some files failed while processing, this is normal since some of the files have already been deleted before performing a backup. However, if there are no successful files indicated, the command was not properly executed.
b. Type icacls . /grant system:f /t then hit Enter to adjust the ACL back to System. Now, you can set the owner of the drive by typing icacls Y: /setowner “SYSTEM” /t /c then press Enter.
c. Check if the device’s SRP now has enough free space by going back to Disk Management and refreshing the data. If the SRP already has sufficient space, you can now remove the drive letter. Right-click on the System Reserved Partition then choose Change Drive Letter and Paths. Select the Y: drive then choose Confirm deleting the drive letter by clicking OK.
This method makes a larger, but temporary, increase in the SRP free space.
1. Be sure you have an external drive having at least 250 MB free space and formatted as NFTS.2. Open Run by pressing the Windows key + R. Type mscthen to choose the Recovery Partition. Right-click on it then choose Change Drive Letter and Paths.
3. Select Add then type Y for the drive letter, click
4. Click on the Start screen then type cmd in the search bar. In the results, right-click on Command Prompt then choose Run as administrator. The command prompt window will appear.
5. Switch to another drive by typing Y: in the command prompt. Once you’re in the drive Y, type takeown /d y /r /f .
NOTE: Ensure that space and period after “f” are included in order for the command to work properly.
Error Causes
Error Causes“Windows is unable to reach your company’s activation service. Please connect to your corporate network. If you are connected and continue to see the error, contact your system administrator. You can also click on the error detail to find the exact error. Error code: 0xC004F074.” “Activating Windows(R), (Key hash)… Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information.” “Error 0xC004F074, SL_E_AUTHN_MISMATCHED_KEY, The Software Licensing Service reported that the key is mismatched.”To fix the Windows 10 Activation error 0xC004F078, you have to use the correct key for your type of Windows copy or use Command Prompt to reinstall the key or you could also try running the Activation troubleshooter.