Cannot access any Cloudflare based site

I recently changed ISP and since then I can’t open any site behind Cloudflare.

I can resolve the IP, I can trace them, I can ping them, but when trying to open them on any browser I get “connection timeout”

At first it seemed to happen at random, but once I started having more data I found out they all have Cloudflare in common.

Is there something I can do?

traceroute to pobb.in (188.114.97.7), 30 hops max, 60 byte packets
 1  192.168.178.1 (192.168.178.1)  0.305 ms  0.433 ms  0.578 ms
 2  100.68.0.1 (100.68.0.1)  14.096 ms  14.155 ms  14.031 ms
 3  10.104.205.65 (10.104.205.65)  12.890 ms  12.858 ms  12.934 ms
 4  213-156-51-165.ip.fastwebnet.it (213.156.51.165)  13.066 ms  12.968 ms  14.085 ms
 5  93-57-68-109.ip163.fastwebnet.it (93.57.68.109)  24.428 ms  24.282 ms  24.345 ms
 6  10.254.11.165 (10.254.11.165)  26.538 ms 10.254.0.169 (10.254.0.169)  26.218 ms  26.247 ms
 7  93-63-100-225.ip27.fastwebnet.it (93.63.100.225)  23.864 ms 93-63-100-229.ip27.fastwebnet.it (93.63.100.229)  22.125 ms  22.159 ms
 8  cloudflare.mix-it.net (217.29.66.167)  22.594 ms  23.040 ms  22.696 ms
 9  188.114.100.11 (188.114.100.11)  22.774 ms  22.397 ms  22.721 ms
10  188.114.97.7 (188.114.97.7)  22.625 ms  22.927 ms  22.973 ms

I already contacted my ISP but they have been less than helpful since according to them they are not causing any of this so they can do nothing about it.

The trace route seems fine and you’re able to connect to this site which is also behind Cloudflare.

Can you provide some domains you can repro with? Could you also capture a HAR (Gathering information for troubleshooting sites · Cloudflare Support docs)?

Here’s 3 tests.
All of these sites are up and running and I can connect to them with no issue switching to my mobile network.

I’m sorry I can’t upload those files so I’ll just copy/paste their content.

{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "Firefox",
      "version": "121.0"
    },
    "browser": {
      "name": "Firefox",
      "version": "121.0"
    },
    "pages": [
      {
        "id": "page_3",
        "pageTimings": {
          "onContentLoad": -1,
          "onLoad": -1
        },
        "startedDateTime": "2023-12-30T11:45:48.035+01:00",
        "title": "http://asuratoon.com/"
      }
    ],
    "entries": [
      {
        "startedDateTime": "2023-12-30T11:45:48.035+01:00",
        "request": {
          "bodySize": 0,
          "method": "GET",
          "url": "http://asuratoon.com/",
          "httpVersion": "",
          "headers": [
            {
              "name": "Host",
              "value": "asuratoon.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0"
            },
            {
              "name": "Accept",
              "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"
            },
            {
              "name": "Accept-Language",
              "value": "en-GB,en;q=0.5"
            },
            {
              "name": "Accept-Encoding",
              "value": "gzip, deflate"
            },
            {
              "name": "Connection",
              "value": "keep-alive"
            },
            {
              "name": "Upgrade-Insecure-Requests",
              "value": "1"
            }
          ],
          "cookies": [],
          "queryString": [],
          "headersSize": 347
        },
        "response": {
          "status": 0,
          "statusText": "",
          "httpVersion": "",
          "headers": [],
          "cookies": [],
          "content": {
            "mimeType": "",
            "size": 0,
            "encoding": "base64",
            "text": ""
          },
          "redirectURL": "",
          "headersSize": 0,
          "bodySize": 0
        },
        "cache": {},
        "timings": {
          "blocked": 0,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 0,
          "receive": 0
        },
        "time": 0,
        "_securityState": "insecure",
        "pageref": "page_3"
      }
    ]
  }
}
{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "Firefox",
      "version": "121.0"
    },
    "browser": {
      "name": "Firefox",
      "version": "121.0"
    },
    "pages": [
      {
        "id": "page_1",
        "pageTimings": {
          "onContentLoad": -976725,
          "onLoad": -15
        },
        "startedDateTime": "2023-12-30T11:39:15.696+01:00",
        "title": "http://pobb.in/"
      }
    ],
    "entries": [
      {
        "startedDateTime": "2023-12-30T11:39:15.696+01:00",
        "request": {
          "bodySize": 0,
          "method": "GET",
          "url": "http://pobb.in/",
          "httpVersion": "",
          "headers": [
            {
              "name": "Host",
              "value": "pobb.in"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0"
            },
            {
              "name": "Accept",
              "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"
            },
            {
              "name": "Accept-Language",
              "value": "en-GB,en;q=0.5"
            },
            {
              "name": "Accept-Encoding",
              "value": "gzip, deflate"
            },
            {
              "name": "Connection",
              "value": "keep-alive"
            },
            {
              "name": "Upgrade-Insecure-Requests",
              "value": "1"
            }
          ],
          "cookies": [],
          "queryString": [],
          "headersSize": 341
        },
        "response": {
          "status": 0,
          "statusText": "",
          "httpVersion": "",
          "headers": [],
          "cookies": [],
          "content": {
            "mimeType": "",
            "size": 0,
            "encoding": "base64",
            "text": ""
          },
          "redirectURL": "",
          "headersSize": 0,
          "bodySize": 0
        },
        "cache": {},
        "timings": {
          "blocked": 0,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 0,
          "receive": 0
        },
        "time": 0,
        "_securityState": "insecure",
        "pageref": "page_1"
      },
      {
        "startedDateTime": "2023-12-30T11:40:09.135+01:00",
        "request": {
          "bodySize": 0,
          "method": "GET",
          "url": "http://pobb.in/",
          "httpVersion": "",
          "headers": [
            {
              "name": "Host",
              "value": "pobb.in"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0"
            },
            {
              "name": "Accept",
              "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"
            },
            {
              "name": "Accept-Language",
              "value": "en-GB,en;q=0.5"
            },
            {
              "name": "Accept-Encoding",
              "value": "gzip, deflate"
            },
            {
              "name": "Connection",
              "value": "keep-alive"
            },
            {
              "name": "Upgrade-Insecure-Requests",
              "value": "1"
            },
            {
              "name": "Pragma",
              "value": "no-cache"
            },
            {
              "name": "Cache-Control",
              "value": "no-cache"
            }
          ],
          "cookies": [],
          "queryString": [],
          "headersSize": 384
        },
        "response": {
          "status": 0,
          "statusText": "",
          "httpVersion": "",
          "headers": [],
          "cookies": [],
          "content": {
            "mimeType": "",
            "size": 0,
            "encoding": "base64",
            "text": ""
          },
          "redirectURL": "",
          "headersSize": 0,
          "bodySize": 0
        },
        "cache": {},
        "timings": {
          "blocked": 0,
          "dns": 1,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 0,
          "receive": 0
        },
        "time": 1,
        "_securityState": "insecure",
        "pageref": "page_1"
      }
    ]
  }
}
{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "Firefox",
      "version": "121.0"
    },
    "browser": {
      "name": "Firefox",
      "version": "121.0"
    },
    "pages": [
      {
        "id": "page_2",
        "pageTimings": {
          "onContentLoad": -1,
          "onLoad": -1
        },
        "startedDateTime": "2023-12-30T11:43:30.102+01:00",
        "title": "https://www.craftofexile.com/"
      }
    ],
    "entries": [
      {
        "startedDateTime": "2023-12-30T11:43:30.102+01:00",
        "request": {
          "bodySize": 0,
          "method": "GET",
          "url": "https://www.craftofexile.com/",
          "httpVersion": "",
          "headers": [
            {
              "name": "Host",
              "value": "www.craftofexile.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0"
            },
            {
              "name": "Accept",
              "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"
            },
            {
              "name": "Accept-Language",
              "value": "en-GB,en;q=0.5"
            },
            {
              "name": "Accept-Encoding",
              "value": "gzip, deflate, br"
            },
            {
              "name": "Connection",
              "value": "keep-alive"
            },
            {
              "name": "Upgrade-Insecure-Requests",
              "value": "1"
            },
            {
              "name": "Sec-Fetch-Dest",
              "value": "document"
            },
            {
              "name": "Sec-Fetch-Mode",
              "value": "navigate"
            },
            {
              "name": "Sec-Fetch-Site",
              "value": "none"
            },
            {
              "name": "Sec-Fetch-User",
              "value": "?1"
            }
          ],
          "cookies": [],
          "queryString": [],
          "headersSize": 452
        },
        "response": {
          "status": 0,
          "statusText": "",
          "httpVersion": "",
          "headers": [],
          "cookies": [],
          "content": {
            "mimeType": "",
            "size": 0,
            "encoding": "base64",
            "text": ""
          },
          "redirectURL": "",
          "headersSize": 0,
          "bodySize": 0
        },
        "cache": {},
        "timings": {
          "blocked": 0,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 0,
          "receive": 0
        },
        "time": 0,
        "_securityState": "insecure",
        "pageref": "page_2"
      }
    ]
  }
}

Have you tried Cloudflare’s Public DNS instead of your ISP’s default DNS.

This is the first thing I do whenever I connect a new device to internet with my ISP.

I’m already using them.

I’m trying to see if the issue is caused by IPv6 because pinging directly from the router in IPv4 seems to work, doing it in IPv6 goes in timeout.

Infortunately disabling IPv6 sorted no effects.

The one thing I failed to specify is that this new ISP does not provide me with an external IPv4 but I am natted through a shared one.

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