Why is my ISP network banned from accessing Dropbox?

Hi Здравко, thanks for messaging the Community.

Currently, we're not experiencing any issues with users accessing the Dropbox site.

If it's specific to one ISP, then you'll need to check with them to see that they haven't blocked traffic to the following Dropbox domains.

If you have any further queries, feel free to message back.

Jay, if the traffic was blocked, would such a message even be visible? It's Dropbox generated! More precisely Dropbox forum. If the traffic was blocked, I would never see it!!!

And yes, the above appear only when I use link through https://www.vivacom.bg/. Does Dropbox has some some argues with? Dropbox cuts the link!!!

PS: Till yesterday everything was fine. I just discover the issue. Something happened on your side in meantime.

ADD: More information about the "blocked" network traffic (I hope will be useful for your engineers to trace what's going on):

GET / HTTP/2
Host: www.dropboxforum.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/png,image/svg+xml,*/*;q=0.8
Accept-Language: bg,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br, zstd
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Priority: u=0, i
Pragma: no-cache
Cache-Control: no-cache

HTTP/2 302
content-length: 0
location: https://www.dropboxforum.com:443/t5/errors/FilterErrorHandlerPage
date: Thu, 18 Jul 2024 12:34:42 GMT
set-cookie: ...
set-cookie: ...
server: Apache
pragma: no-cache
expires: Thu, 01 Jan 1970 00:00:00 GMT
cache-control: no-cache, no-store, must-revalidate, private
set-cookie: LiSESSIONID=89D76000DB79839D4E17945746AAFB73; Path=/; Secure; HttpOnly;SameSite=None
set-cookie: ...
set-cookie: ...
set-cookie: ...
x-cache: Miss from cloudfront
via: 1.1 19cd9c9f4eb51e9e5c75add1d4b6f304.cloudfront.net (CloudFront)
x-amz-cf-pop: VIE50-C2
x-amz-cf-id: Y2KQ9s_fxuLSY1z9nbd0gM92_zn33OhpcBVsW2cWs_scoPxON7G-Kw==
X-Firefox-Spdy: h2

GET /t5/errors/FilterErrorHandlerPage HTTP/2
Host: www.dropboxforum.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/png,image/svg+xml,*/*;q=0.8
Accept-Language: bg,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br, zstd
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Cookie: ...
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Priority: u=0, i
Pragma: no-cache
Cache-Control: no-cache
TE: trailers

HTTP/2 403
content-type: text/html;charset=UTF-8
date: Thu, 18 Jul 2024 12:34:42 GMT
set-cookie: ...
set-cookie: ...
server: Apache
x-frame-options: SAMEORIGIN
pragma: no-cache
expires: Thu, 01 Jan 1970 00:00:00 GMT
cache-control: no-cache, no-store, must-revalidate, private
x-robots-tag: noindex, nofollow
set-cookie: ...
x-cache: Error from cloudfront
via: 1.1 19cd9c9f4eb51e9e5c75add1d4b6f304.cloudfront.net (CloudFront)
x-amz-cf-pop: VIE50-C2
x-amz-cf-id: P_EBJ_TijmRuYepv3i7mlvpDOdG_QZq2n0xF5rKB3QewnLS3FCJO-A==
X-Firefox-Spdy: h2

And as result of above "blocked" traffic finally appears the page in OP. Only the cookies has cut.

That's it.

Sheena, As far as know, you are part of forum support tech team. Can you share some thoughts about where that redirect to error page comes from (visible above in the traffic dump, in the first request response)? 🙏😳

Could you clarify exactly what you mean? Is it that links to Dropbox from that site you mentioned don't work at all?

Or, is it when you connect using that ISP, you can't access the site? Do you use a VPN on your machine?

---

Jay wrote:

Could you clarify exactly what you mean? Is it that links to Dropbox from that site you mentioned don't work at all?

...

---

Jay, "exactly what you mean"? Does the traffic dump not enough? Whenever I open anything on www.dropboxforum.com it redirects me to the error page (again, exactly as clearly seen on the dump)!!! Take a look en focus on:

...

location: https://www.dropboxforum.com:443/t5/errors/FilterErrorHandlerPage

...

It's something that comes from Dropbox!!! Why????

---

Jay wrote:

...

Or, is it when you connect using that ISP, you can't access the site? ...

---

Take a look on the page above (OP). How do you think - is this a Dropbox Forum site access or not? 🤔

---

Jay wrote:

... Do you use a VPN on your machine?

---

No... nothing like that... My connection is direct. no VPN, no proxy, etc.

Hi Здравко , thanks for letting us know. Our community is hosted by a 3rd party vendor, and since this is one ISP affected I would guess that there is a temporary block due to high traffic or something to that effect. Especially as it was working for you just yesterday, I believe that it will work again very soon.

I have logged a ticket with our community host to check on their side if there's any issues, and I'll post back here when I know more. If it does start working again in the meantime, please let me know so we can check the logs.

Thanks again!

Thanks Sheena, Ok thanks for clarification. 😉

Let's hope it will be back soon. And yes, I will let you know once I find it's working again.

Thanks again.

It works 1~2 times per day for few clicks (at most) and all the rest is as described above....

As seems by now, it won't work again very soon... 😕

ADD: Another interesting information that isolates the places to debug is that troubles come only from some of the hosts that www.dropboxforum.com resolve to: the defaults - 13.32.110.3, 13.32.110.27, 13.32.110.83, 13.32.110.92. The mentioned hosts carry troubles!

If I force browser use other matching IP (18.244.87.106 for instance) everything works correct regardless used link. You can check the particular servers settings and/or status.

I hope this helps improving your service and speeds up issue resolving.

Hi again Sheena,

As seems, the broken link that your server scripts refused to serve is back to normal work from yesterday. I'm writing this post while connected with the same link.

Hope you're are doing well and wish you nice monday and week ahead. 😉

Hi Здравко ,

Our team are still working on this issue in the background, so they may have fixed it, but I suspect that this was an issue on the ISP side, as that is more common. I'll pass on the message though and will reply here again when I know more.

All the best, hope you have a wonderful day 😊 Thanks!

---

Sheena wrote:

..., but I suspect that this was an issue on the ISP side, as that is more common. ...

---

I don't think it could be issue at ISP side at all. What are you motives to think so? 🤔

Motives in opposite direction:

1. All other sites worked (and continue work) without issue;
2. Even the connection to Dropbox forum works (as such). Dropbox forum refused to serve the request! The request itself was reaching Dropbox forum site and the response (status 403) successfully was flowing back (as can be seen in the dump). What ISP issue here?!

Anyway, its back to work. 😉 It's good idea you understand what was wrong though, so it will be prevented in the future.