> For the complete documentation index, see [llms.txt](https://mudfish.gitbook.io/topics/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mudfish.gitbook.io/topics/vpn/firewall.md).

# Firewall

{% tabs %}
{% tab title="한국어" %}
{% embed url="<https://docs.mudfish.net/ko/docs/mudfish-cloud-vpn/tech-support-unsupported-games>" %}
<https://docs.mudfish.net/ko/docs/mudfish-cloud-vpn/tech-support-unsupported-games>
{% endembed %}

{% embed url="<https://docs.mudfish.net/ko/docs/mudfish-troubleshooting/firewall-intro/>" %}

[MUDEC\_00086](https://docs.mudfish.net/ko/docs/mudfish-troubleshooting/errorcodes/#mudec-00086) , [MUDEC\_00089](https://mudfish.net/docs/ko/vpn/errorcodes.html#mudec-00089)  안티 바이러스/보안 프로그램/[방화벽](https://docs.mudfish.net/ko/docs/mudfish-troubleshooting/firewall-intro)을 잠시 멈추시거나 미꾸라지를 검사하지 않도록 예외 처리를 해 보시기 바랍니다.  <https://mudfish.net/forums/2/topics/804>

#### Mudfish Launcher 실행 옵션

![http://wiki.mudfish.net/Mudfish%20Launcher%20%EC%8B%A4%ED%96%89%20%EC%98%B5%EC%85%98](/files/-Lc554CRLGaNaBaeUwzg)

#### 중계 서버 고급 모드

![https://docs.mudfish.net/ko/docs/mudfish-features/advanced-node-mode](/files/-Lc53--HA4GaecODr5Kx)

#### 연결 프로토콜 변경

![https://docs.mudfish.net/ko/docs/mudfish-launcher/setup/#%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%A8](/files/-Lc50QuVt2KNG-8XPpdW)

#### netsh winsock reset

![https://support.microsoft.com/en-us/help/299357/how-to-reset-tcp-ip-by-using-the-netshell-utility](/files/-Lc5DnKcztVM49QgYBYy)

#### MTU 변경

![1450부터 50씩 낮춤](/files/-Lc52E83jT4Bez5Fg76C)

#### MAC Address 변경

{% embed url="<https://iptime.com/iptime/?page_id=67&pageid=1&mod=document&keyword=MAC&uid=18124>" %}
<https://iptime.com/iptime/?page\\_id=67\\&pageid=1\\&mod=document\\&keyword=MAC\\&uid=18124>
{% endembed %}

![http://192.168.0.1/sess-bin/timepro.cgi?tmenu=netconf\&smenu=wansetup](/files/-Lc4rX-9upo_VYt5A6uo)

![http://192.168.1.1/cgi-bin/luci/admin/network/network/lan](/files/-Lc5HTpYDrPZ7HfPKfRr)

{% embed url="<https://docs.mudfish.net/ko/docs/mudfish-dns-client/>" %}
<https://docs.mudfish.net/ko/docs/mudfish-dns-client/>
{% endembed %}

{% endtab %}

{% tab title="English" %}
Please try to

* enable [Full VPN mode](https://docs.mudfish.net/en/docs/mudfish-features/fullvpn-mode) &#x20;
* [Advanced mode](https://docs.mudfish.net/en/docs/mudfish-cloud-vpn/faq-nodes/#what-is-the-advantage-of-connecting-to-the-game-through-two-mudfish-nodes-over-one) &#x20;
* use uppercase `-O` option to change the Mudfish's working method as refer Firewall - [Mudfish Master Server](https://docs.mudfish.net/en/docs/mudfish-troubleshooting/firewall-master-conn/) ![image](https://image.mudfish.net/o/1qrbKL) &#x20;
* [reset TCP/IP with netsh](https://support.microsoft.com/en-us/help/299357/how-to-reset-tcp-ip-by-using-the-netshell-utility) &#x20;
* consider to change [MAC Address](https://mudfish.net/docs/en/support/firewall.html#changing-mac-address) &#x20;
* consider reducing [MTU](https://mudfish.net/docs/en/vpn/errorcodes.html#mudec-00179) from 1450
  {% endtab %}
  {% endtabs %}

{% content-ref url="/pages/-LWzXSF9sE7II6rLPFW9" %}
[MUDEC\_00281](/topics/vpn/firewall/mudec_00281.md)
{% endcontent-ref %}

{% content-ref url="/pages/-LWxf-HUG3fmbuB4hfJx" %}
[process x, MUDEC\_00299, MUDEC\_00022](/topics/vpn/firewall/process-x.md)
{% endcontent-ref %}