vless + mkcp don't provide connection to any site

[AndreyRz]

I set up a vless connection with the mkcp protocol, but it feels like the requests do not go further than the server, I can ping my server or any site, but they do not open in the browser and the status of the computer does not have an Internet connection, I tried to change the mtu from 1350 to 1500, but it did not help. xray version is 1.8.15 and x-ui 1.8.2

{
  "dns": {
    "queryStrategy": "UseIP",
    "servers": [
      {
        "address": "8.8.8.8",
        "skipFallback": false
      }
    ],
    "tag": "dns_out"
  },
  "inbounds": [
    {
      "port": 10808,
      "protocol": "socks",
      "settings": {
        "auth": "noauth",
        "udp": true,
        "userLevel": 8
      },
      "sniffing": {
        "destOverride": [
          "http",
          "tls",
          "fakedns"
        ],
        "enabled": true
      },
      "tag": "socks"
    },
    {
      "port": 10809,
      "protocol": "http",
      "settings": {
        "userLevel": 8
      },
      "tag": "http"
    }
  ],
  "log": {
    "loglevel": "warning"
  },
  "outbounds": [
    {
      "protocol": "vless",
      "tag": "proxy",
      "streamSettings": {
        "kcpSettings": {
          "congestion": false,
          "downlinkCapacity": 12,
          "header": {
            "type": "utp"
          },
          "mtu": 1350,
          "readBufferSize": 20,
          "seed": "dP81Wl47xz",
          "tti": 20,
          "uplinkCapacity": 12,
          "writeBufferSize": 20
        },
        "network": "kcp",
        "security": "none"
      },
      "settings": {
        "vnext": [
          {
            "address": "******",
            "port": 442,
            "users": [
              {
                "encryption": "none",
                "id": "6cf0cc55-12ce-416e-edb7-a3749efbff62",
                "level": 8
              }
            ]
          }
        ]
      }
    },
    {
      "protocol": "freedom",
      "settings": {
        "domainStrategy": "UseIP"
      },
      "tag": "direct"
    },
    {
      "protocol": "blackhole",
      "settings": {
        "response": {
          "type": "http"
        }
      },
      "tag": "block"
    }
  ],
  "policy": {
    "levels": {
      "8": {
        "connIdle": 300,
        "downlinkOnly": 1,
        "handshake": 4,
        "uplinkOnly": 1
      }
    },
    "system": {
      "statsOutboundDownlink": true,
      "statsOutboundUplink": true
    }
  },
  "remarks": "mKCP-test",
  "routing": {
    "domainStrategy": "IPIfNonMatch",
    "rules": [
      {
        "network": "tcp,udp",
        "outboundTag": "proxy",
        "type": "field"
      }
    ]
  },
  "stats": {}
}