# IP address blocked

**URL:** <https://community.jenkins.io/t/ip-address-blocked/11419>\
**Category:** Site Feedback\
**Tags:** question\
**Created:** [December 22, 2023, 12:33am UTC](https://community.jenkins.io/t/ip-address-blocked/11419 "2023-12-22T00:33:43Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Palfreman](https://avatars.discourse-cdn.com/v4/letter/p/c4cdca/32.png) [@Palfreman](https://community.jenkins.io/u/Palfreman)\
**Post date:** [December 22, 2023, 12:33am UTC](https://community.jenkins.io/t/ip-address-blocked/11419/1 "2023-12-22T00:33:43Z")

</div>

I seem to have been blocked from the [jenkins.io](http://jenkins.io) website. I use Jenkins every day professionally but set up my own for practice about eight months ago. Was fine. Now the whole site is blocked to me (am using my phone hotspot to send this). I noticed because all updates failed and reinstalling faliled

Can I send my IP address to someone confidentially? I don’t really want to plaster it here. I suspect I am on some so of blocklist but none I have been able to find and the reason is not obvious to me. If I am on a blocklist that you use I would like to know so I can see about why it has happened.

---

<div class="post-metadata">

**Author:** ![MarkEWaite](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/markewaite/32/20_2.png) [@MarkEWaite](https://community.jenkins.io/u/MarkEWaite)\
**Post date:** [December 22, 2023, 3:27pm UTC](https://community.jenkins.io/t/ip-address-blocked/11419/2 "2023-12-22T15:27:30Z")

</div>

> [@Palfreman](#):
>
> Now the whole site is blocked to me (am using my phone hotspot to send this). I noticed because all updates failed and reinstalling failed

The Jenkins project does not block IP addresses generally. The Jenkins web sites (like [www.jenkins.io](http://www.jenkins.io) and [plugins.jenkins.io](http://plugins.jenkins.io) and [updates.jenkins.io](http://updates.jenkins.io)) do not block IP addresses. Mirror providers sometimes block IP addresses. In those cases, the mirror provider usually blocks because they’ve detected misbehavior from that IP address or the IP address range.

You can see which mirrors are selected for you by opening a [mirrorlist URL](https://updates.jenkins.io/latest/git.hpi?mirrorlist) from your computer. Your web browser will follow the redirects to show you which mirrors are used from your location.

You mentioned the [jenkins.io](http://jenkins.io) web site and said that you needed to use a phone hotspot to post to [community.jenkins.io](http://community.jenkins.io). The [community.jenkins.io](http://community.jenkins.io) site is donated by Discourse and is hosted by them. The [updates.jenkins.io](http://updates.jenkins.io) site is maintained by the Jenkins infra team without a content delivery network. The [www.jenkins.io](http://www.jenkins.io) site is maintained by the Jenkins infra team and is hosted on a content delivery network.

If you’re blocked from viewing the [community.jenkins.io](http://community.jenkins.io) site and blocked from downloading updates from [updates.jenkins.io](http://updates.jenkins.io) then I would speculate that the block is on your side of the internet connection. You’re being blocked from sites that are maintained by different organizations. They don’t share IP address lists or any other technique that could be used to block you.

---

<div class="post-metadata">

**Author:** ![Palfreman](https://avatars.discourse-cdn.com/v4/letter/p/c4cdca/32.png) [@Palfreman](https://community.jenkins.io/u/Palfreman)\
**Post date:** [July 11, 2024, 8:26pm UTC](https://community.jenkins.io/t/ip-address-blocked/11419/3 "2024-07-11T20:26:18Z")

</div>

Hi Mark, all. I should say what I did to solve this problem. Neither you or anyone was blocking me, but it certainly looked like it from my perspective.

In fact, the problem was the MTU on my router was incorrectly set. This is the interface setting on my router that my PPPoE interface sits upon:

> $ cat /etc/hostname.em0  
> mtu 1508 up

And what I needed was eight bytes more overhead

> $ cat /etc/hostname.em0  
> mtu 1516 up

After that, all sites worked including yours. I must have been losing more than I thought running PPPoE on top. What was odd was most sites worked throughout. Something about not quite having enough in the frame was breaking some SSL implementations but not all. I haven’t replicated it yet. I probably should.