Blocking dns failed openvpn как исправить
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Blocking dns failed openvpn как исправить

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OpenVPN Support Forum

# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]
# to silence duplicate packet warnings.
# file can be used for all clients.


# EasyRSA can do this for you.
remote-cert-tls server

# Set log file verbosity.
verb 3

# Silence repeating messages
;mute 20

—pull-filter ignore redirect-gateway

OpenVPN — Blocking DNS failed, unable to connect to VPN

(Moved from ‘DHCP and DNS’ as this is OpenVPN issue) I am having an issue with one of our remote users who can no longer access our LAN. I have a couple of others who also access the servers from overseas with no issue. This has only occurred in the last few weeks and nothing has been knowingly changed at either end. On Friday an attempt was made to create a new connection for the user and doing a clean install of the client using the ‘Client Export’ created installer. The log appears to show everything starting ok until the Blocking DNS service tried to start. Quote
Fri Nov 03 15:07:08 2017 OpenVPN 2.4.1 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Mar 22 2017
Fri Nov 03 15:07:08 2017 Windows version 6.1 (Windows 7) 64bit
Fri Nov 03 15:07:08 2017 library versions: OpenSSL 1.0.2k 26 Jan 2017, LZO 2.09
Enter Management Password:
Fri Nov 03 15:07:08 2017 TCP/UDP: Preserving recently used remote address: [AF_INET]
Fri Nov 03 15:07:08 2017 Attempting to establish TCP connection with [AF_INET] [nonblock]
Fri Nov 03 15:07:09 2017 TCP connection established with [AF_INET]
Fri Nov 03 15:07:09 2017 TCP_CLIENT link local (bound): [AF_INET][undef]:0
Fri Nov 03 15:07:09 2017 TCP_CLIENT link remote: [AF_INET]
Fri Nov 03 15:07:11 2017 [server] Peer Connection Initiated with [AF_INET]
Fri Nov 03 15:07:12 2017 open_tun
Fri Nov 03 15:07:12 2017 TAP-WIN32 device [Local Area Connection 9] opened: \.\Global.tap
Fri Nov 03 15:07:12 2017 Set TAP-Windows TUN subnet mode network/local/netmask = [SUCCEEDED]
Fri Nov 03 15:07:12 2017 Notified TAP-Windows driver to set a DHCP IP/netmask of on interface [DHCP-serv:, lease-time: 31536000]
Fri Nov 03 15:07:12 2017 Successful ARP Flush on interface [26]
Fri Nov 03 15:07:12 2017 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Fri Nov 03 15:07:12 2017 Block_DNS: adding block dns filters using service failed: There are no more endpoints available from the endpoint mapper. [status=0x6d9 if_index=26]
Fri Nov 03 15:07:12 2017 Blocking DNS failed!
Fri Nov 03 15:07:12 2017 Exiting due to fatal error Any advice on the cause and how to rectify this would be greatly appreciated.

johnpoz LAYER 8 Global Moderator

Your on old version of openvpn 2.4.1 Current is 2.4.4 What version of pfsense are you running.. Here is whole thread about this here I would suggest you update.

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SG-4860 23.05.1 | Lab VMs 2.7, 23.05.1


PFSense is currently running version 2.3.4 and it says there is the option to upgrade to version 2.4.1 I am a little reluctant to do this as it could potentially lead to other issues (especially after reading through some of the problems others have had after doing the same) and it is only affecting one person. There is an option on the ‘Certificate Export’ page to use the ‘Old Windows Installer’ ver 2.3.14, as this is also a 2.3 release (as the server), could trying this potentially ‘fix’ the issue? I will give this a go. It should be noted that several users have been using the 2.4.1 client, as issued by the Client Export page, with no problems.

OpenVPN Error in add_block_dns_filters()

Часто возникающая ошибка при попытке подключения OpenVPN:

Error in add_block_dns_filters(): add_sublayer: failed to add persistent sublayer : Access is denied. [status=0x5]
Blocking DNS failed!

Проблема решается очень просто! Запуск GUI приложения от имени Администратора.

Troubleshooting NordVPN connectivity on Windows

Issues with NordVPN app configuration

  • Make sure your NordVPN account is active.
  • Check if you’re using the latest NordVPN application version (7.8.5).
    • To do so, open the app, click on Settings (the gear icon at the bottom) and you’ll see the app version at the top, right below the Settings headline.
    • If you are using the older version,uninstall the VPN appanddownload the latest NordVPN version for Windows.
    1. Click on the Settings (gear icon) in the bottom left corner.
    2. Click General.
    3. Scroll down until you see the Diagnostics section and click Run diagnostics.
    4. A new window will open. Select Reset app.

    Issues with the Windows OS

    The issue might lie in the configuration of your Windows OS, its applications, and networks. Check out our article on common NordVPN app issues on Windows.

    FATAL: Blocking DNS failed error

    If you are getting a FATAL: Blocking DNS failed error:

    • Reinstall the NordVPN TAP drivers:
    1. Go to Control Panel >Add or remove programs.
    2. Find NordVPN network TAP and delete it.
    3. Download and install the TAP drivers.
    4. Try connecting again.
    • If the issue persists, try the following steps:
    1. Go to Network and Sharing Center.
    2. Select Change Adapter Settings.
    3. Right-click TAP-NordVPN Windows Adapter and select Properties.
    4. Select TCP/IPv4 and click Properties.
    5. Click on the Advanced tab, uncheck Automatic, and set Interface metric to 1.

    Related Articles

    • How to set up manual connection on Windows 7 and above
    • Share VPN via a mobile hotspot on Windows 10
    • How to connect to NordVPN with IKEv2/IPSec on Windows 10

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