请问HN：不寻常的网络过滤器
我遇到了一个奇怪的情况：在公共部门，有一个隔离网络（由OPPO制造的WiFi-5G接入点、路由器和调制解调器，由无线运营商品牌化，一台通过以太网连接到OPPO路由器的Linux桌面，一台通过WiFi连接的安卓电视，以及几部通过WiFi连接的员工手机）。这个不寻常的问题是，尽管网络设置（DNS、2.4/5GHz等）正常，YouTube在电视上无法使用，但在其他地方却可以正常访问。电视显示网络访问受限，无法加载YouTube应用（但可以加载Netflix应用）。在通过以太网连接的桌面和通过WiFi连接的手机上，YouTube都可以正常使用。在Linux桌面上使用Curl命令访问YouTube网站时，能够得到正确的HTTP响应。路由器控制面板可以访问，且没有任何异常条目可能会阻止电视访问YouTube。你有没有什么想法，为什么YouTube会在电视上被屏蔽？
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I encountered a strange situation: in public sector, there is a isolated network (wifi-5g ap-router-modem, made by oppo branded by wireless career, one Linux desktop connected with Ethernet to oppo router, one android tv connected over wifi and employee owned phones connected over wifi). The unusual problem is that regarding of network settings (dns, 2.4/5ghz and so on) YouTube does not work on tv but works everywhere else. TV shows that network has limited access and does not load YouTube app (but loads Netflix app). YouTube is available on both desktop over Ethernet and phone over wifi. Curl on Linux desktop shows proper http response to youtube site. Router control panel is accessible and does not contain any unusual entries that might block yt access on tv. Do you have any idea how youtube might be blocked on tv?