DNS problem: query timed out looking up A for *.simplyspamfree.com


We have an issue with getting new certificates for our servers. It seems that this happened before and there is another thread about it.
As you can see below:

"detail": "DNS problem: query timed out looking up A for server1.test20.simplyspamfree.com",                              
        "status": 400  
# letsencrypt -v --debug --staging certonly -a standalone -t --agree-tos --email email@email.com -d server1.test20.simplyspamfree.com --csr csr.der --fullchain-path fullchain.pem --keep

Please do note that this is on staging.

Also, as you can see these queries are fine from other DNS servers:

A post was merged into an existing topic: Staging disruption