Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com ), so withholding your domain name here does not increase secrecy, but …

Anyone .MIL following this thread, issue is resolved. Thanks again for the support.

This is getting a lot of heat within DoD. Need to get any information and updates you have.

Let's Encrypt engineering is looking into this. We'd appreciate it if anyone not involved avoids posting in this thread. Thank you.

.mil engineers and operators are available to assist from our end if needs be. We can verify with .mil email addresses to confirm identity. Please feel free to reach out to us.

[image] pdevries: .mil engineers and operators are available to assist from our end if needs be. CC @jherman @kenh1 We currently believe that DNS requests from our primary vantage point are being blocked by the .mil nameservers. From external perspectives (such as our AWS-based multi-perspe…

Ack. Thanks, we were focused on this as a cause as well due to observed differences between v4 and v6 domains. Thank you for the current source info, we're looking into it.

We are currently running into issues pulling certs that seem related. This recently started happening but only for a particular domain. Is there any way to know which DNS endpoint you are using to validate so we can investigate? I have verified the hostname is valid from as many DNS servers as i…

@rthomas There are several posts about problems with the .mil tld in recent days / weeks. I know staff is aware. Your problem is more likely related to that rather than this thread which involved a custom DNS server. You might start your own thread or post on below so the .mil problems are better…

Thank you I will follow up there!

That IP information has helped a lot. We are currently working to get those pulled from getting mitigated.

Works for me! Thanks for everyone's help!

DNS lookup failure for .mil

Help

Topic		Replies	Views
Some Domains Suddenly Failing Renewal or New Cert Issue Help	19	800	April 8, 2026
Dns-01: Remote PerformValidation RPC failed Help	22	4955	March 3, 2020
During secondary validation: DNS problem: SERVFAIL looking up A for - the domain's nameservers may be malfunctioning Help	44	9709	October 7, 2020
Was there some dns lookup failure in recent days? Help	22	2497	December 19, 2022
DNS problem: SERVFAIL looking up A Help	24	4801	January 14, 2020

DNS lookup failure for .mil

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