gpg keys refresh failed - outdated keyserver list

In file /var/www/html/admin/libraries/BMO/GPG.class.php

we see following list of keyservers:

private $keyservers = array(
"pool.sks-keyservers.net", // This should almost always work
"hkp://keyserver.ubuntu.com:80", // This is in case port 11371 is blocked outbound
"pgp.mit.edu", // Other random keyservers
"keyserver.pgp.com", // Other random keyserver
"pool.sks-keyservers.net"
); // Yes. sks is there twice.

 

The problem is that on all servers exept keyserver.ubuntu.com key refresh fails.

 

for pool.sks-keyservers.net:

[root@isecfreepbx ~]# host pool.sks-keyservers.net
pool.sks-keyservers.net has address 198.46.203.97
pool.sks-keyservers.net has address 188.138.33.10
pool.sks-keyservers.net has address 73.101.53.217
pool.sks-keyservers.net has address 81.6.42.101
pool.sks-keyservers.net has address 130.133.110.62
pool.sks-keyservers.net has address 195.201.13.139
pool.sks-keyservers.net has address 74.50.54.68
pool.sks-keyservers.net has address 130.206.1.8
pool.sks-keyservers.net has address 91.143.92.136
pool.sks-keyservers.net has address 78.46.239.68

 

[asterisk@isecfreepbx .gnupg]$ gpg --refresh-keys --keyserver 188.138.33.10
gpg: refreshing 2 keys from hkp://188.138.33.10
gpg: requesting key 69D2EAD9 from hkp server 188.138.33.10
gpg: requesting key B33B4659 from hkp server 188.138.33.10
gpg: key 69D2EAD9: "FreePBX Mirror 1 (Module Signing - 2014/2015) <security@freepbx.org>" not changed
gpg: packet(13) too large
gpg: read_block: read error: Invalid packet

 

pool.sks-keyservers.net has address 73.101.53.217
gpg: keyserver timed out
pool.sks-keyservers.net has address 81.6.42.101
gpgkeys: key 1013D73FECAC918A0A25823986CE877469D2EAD9 not found on keyserver
gpgkeys: key 2016349F5BC6F49340FCCAF99F9169F4B33B4659 not found on keyserver

 

pool.sks-keyservers.net has address 130.133.110.62
gpgkeys: key 1013D73FECAC918A0A25823986CE877469D2EAD9 can't be retrieved
gpg: packet(13) too large

 

pool.sks-keyservers.net has address 195.201.13.139
gpgkeys: HTTP fetch error 52: Empty reply from server
gpgkeys: HTTP fetch error 52: Empty reply from server

 

pool.sks-keyservers.net has address 74.50.54.68

pool.sks-keyservers.net has address 130.206.1.8
gpg: packet(13) too large
gpg: read_block: read error: Invalid packet

 

pool.sks-keyservers.net has address 91.143.92.136
gpgkeys: key 1013D73FECAC918A0A25823986CE877469D2EAD9 can't be retrieved
gpgkeys: key 2016349F5BC6F49340FCCAF99F9169F4B33B4659 can't be retrieved

 

pool.sks-keyservers.net has address 78.46.239.68
gpg: packet(13) too large
gpg: read_block: read error: Invalid packet

 

pool.sks-keyservers.net has address 198.46.203.97
gpgkeys: HTTP fetch error 52: Empty reply from server
gpgkeys: HTTP fetch error 52: Empty reply from server

 

For pgp.mit.edu:

[asterisk@isecfreepbx ~]$ gpg --refresh-keys --keyserver pgp.mit.edu
gpg: refreshing 2 keys from hkp://pgp.mit.edu
gpg: requesting key 69D2EAD9 from hkp server pgp.mit.edu
gpg: requesting key B33B4659 from hkp server pgp.mit.edu
gpgkeys: key 1013D73FECAC918A0A25823986CE877469D2EAD9 can't be retrieved
gpgkeys: key 2016349F5BC6F49340FCCAF99F9169F4B33B4659 can't be retrieved

 

keyserver.pgp.com:

[asterisk@isecfreepbx ~]$ gpg --refresh-keys --keyserver keyserver.pgp.com
gpg: refreshing 2 keys from hkp://keyserver.pgp.com
gpg: requesting key 69D2EAD9 from hkp server keyserver.pgp.com
gpg: requesting key B33B4659 from hkp server keyserver.pgp.com
gpg: keyserver timed out
gpg: keyserver refresh failed: Keyserver error

 

Only working keyserver is ubuntu:

[asterisk@isecfreepbx ~]$ gpg --refresh-keys --keyserver hkp://keyserver.ubuntu.com:80
gpg: refreshing 2 keys from hkp://keyserver.ubuntu.com:80
gpg: requesting key 69D2EAD9 from hkp server keyserver.ubuntu.com
gpg: requesting key B33B4659 from hkp server keyserver.ubuntu.com
gpg: key 69D2EAD9: "FreePBX Mirror 1 (Module Signing - 2014/2015) <security@freepbx.org>" not changed
gpg: key B33B4659: "FreePBX Module Signing (This is the master key to sign FreePBX Modules) <modules@freepbx.org>" not changed
gpg: Total number processed: 2
gpg: unchanged: 2