[LINUX] Dealing with the error that HTTP fetch error occurs in gpg and the key cannot be obtained

TL;DR

--hkp port is usually 11371 --Specify an available port, such as gpg --keyserver hkp: //keyserver.ubuntu.com:80

Status

When I tried to install pritunl on centos7 on the corporate virtual host, I got the following error

$ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys CF8E292A
gpg:Key CF8E292A from hkp to server keyserver.ubuntu.Request to com
gpgkeys: HTTP fetch error 56: Recv failure: Connection reset by peer
gpg:No valid OpenPGP data found.

The hkp port normally uses 11371. The virtual host used this time had an error because outbound 11371 was not allowed due to the security settings.

$ cat /etc/services | grep hkp
pgpkeyserver    11371/tcp       hkp             # PGP/GPG public keyserver
pgpkeyserver    11371/udp       hkp             # PGP/GPG public keyserver

If you can yum, you can use No. 80, so specify: 80.

$ gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys CF8E292A
gpg:Key CF8E292A from hkp to server keyserver.ubuntu.Request to com
gpg:Key CF8E292A:Public key"Pritunl <[email protected]>"Have been imported
gpg:Total number of processes: 1
gpg:import: 1  (RSA: 1)

It worked