I don't see any issues in the hub. There have been no changes to our firewall or internal environment, but our bandwidth was recently upgraded.  However, this was handled by our ISP on their own equipment--no changes were made to our environment. 

I can see the turnkey server hit our firewall when I try to run TKLBAM-Backup, and the firewall indicates the traffic is allowed:

Here are the results from the requested commands:

 

[root@wordpress ~]# tklbam-backup
warning: using cached profile because of a Hub error: error(77, '')
error: error(77, '')
[root@wordpress ~]# turnkey-version
turnkey-wordpress-15.3-stretch-amd64
[root@wordpress ~]# apt policy tklbam

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

tklbam:
  Installed: 1.4.1+37+g8117cd6
  Candidate: 1.4.1+37+g8117cd6
  Version table:
 *** 1.4.1+37+g8117cd6 999
        999 http://archive.turnkeylinux.org/debian stretch/main amd64 Packages
        100 /var/lib/dpkg/status
[root@wordpress ~]# ping -c4 hub.turnkeylinux.org
PING hub.turnkeylinux.org (23.21.244.168) 56(84) bytes of data.
64 bytes from ec2-23-21-244-168.compute-1.amazonaws.com (23.21.244.168): icmp_seq=1 ttl=49 time=30.8 ms
64 bytes from ec2-23-21-244-168.compute-1.amazonaws.com (23.21.244.168): icmp_seq=2 ttl=49 time=30.7 ms
64 bytes from ec2-23-21-244-168.compute-1.amazonaws.com (23.21.244.168): icmp_seq=3 ttl=49 time=30.8 ms
64 bytes from ec2-23-21-244-168.compute-1.amazonaws.com (23.21.244.168): icmp_seq=4 ttl=49 time=30.6 ms

--- hub.turnkeylinux.org ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 30.693/30.782/30.863/0.061 ms