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I'm trying to install an application on an Ubuntu 10.04 via a ppa. This setup is necessary since a customer's error seems to be platform dependent.

Here's what

sudo add-apt-repository ppa:user/app

I get: 

gpg: keyring `/tmp/tmphf6_87/secring.gpg' created
gpg: keyring `/tmp/tmphf6_87/pubring.gpg' created
gpg: requesting key EEA14886 from hkp server keyserver.ubuntu.com
gpgkeys: HTTP fetch error 7: couldn't connect to host
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
recv failed

I tried ping keyserver.ubuntu.com and it worked. I googled the problem but I found nothing.

Gerome Bochmann
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    Are you required to use a proxy server, or is a firewall blocking port 11371? Otherwise it might just be a temporary issue. I can confirm keyserver.ubuntu.com is working right now. – Jens Erat Feb 26 '15 at 22:55
  • Indeed! When I do nmap -p 11371 keyserver.ubuntu.com, it tells me that this port is filtered. It might be filtered by the ubuntu server but that wouldn't really make sense, would it. So, I guess, I have to talk to the admin. If you make that an answer, I can mark this issue as solved. – Gerome Bochmann Feb 27 '15 at 09:15
  • You probably don't need to, see my answer. – Jens Erat Feb 27 '15 at 09:24
  • In our case in was VPN issue - it was blocking connection to port 11371 – Vadim Kotov Sep 14 '17 at 13:41

1 Answers1

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It seems your network filters access to port 11371, which is used by the hkp protocol by default.

To workaround this issue, select another key server that is also available on port 80, by adding the --keyserver hkp://p80.pool.sks-keyservers.net:80 flag to add-apt-repository. This selects one of the key servers available on port 80 from the SKS key server network.

In case port 80 is also only available behind a proxy, you could

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