DNS problem: SERVFAIL looking up CAA

- The following errors were reported by the server:

Domain: tools.srv1.dk
Type:   connection
Detail: DNS problem: SERVFAIL looking up CAA for tools.srv1.dk

Domain: librenms.srv1.dk
Type:   connection
Detail: DNS problem: SERVFAIL looking up CAA for librenms.srv1.dk

Domain: files-origin.srv1.dk
Type:   connection
Detail: DNS problem: SERVFAIL looking up CAA for
files-origin.srv1.dk

Domain: zitcom.srv1.dk
Type:   connection
Detail: DNS problem: SERVFAIL looking up CAA for zitcom.srv1.dk

Why all the SERVFAILs? I don’t see any…

Nameserver

⋊> ~ dig tools.srv1.dk type257 @ns1.srv1.dk                                                                                                                                                         

; <<>> DiG 9.8.3-P1 <<>> tools.srv1.dk type257 @ns1.srv1.dk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6466
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;tools.srv1.dk.			IN	TYPE257

;; AUTHORITY SECTION:
srv1.dk.		600	IN	SOA	ns1.srv1.dk. dns.srv1.dk. 2016101502 14400 600 604800 600

;; Query time: 47 msec
;; SERVER: 128.199.51.147#53(128.199.51.147)
;; WHEN: Sun Oct 16 04:12:00 2016
;; MSG SIZE  rcvd: 75

Google Public DNS

⋊> ~ dig tools.srv1.dk type257 @8.8.8.8                                                                                                                                                             
; <<>> DiG 9.8.3-P1 <<>> tools.srv1.dk type257 @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58034
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;tools.srv1.dk.			IN	TYPE257

;; AUTHORITY SECTION:
srv1.dk.		578	IN	SOA	ns1.srv1.dk. dns.srv1.dk. 2016101502 14400 600 604800 600

;; Query time: 59 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Oct 16 04:12:04 2016
;; MSG SIZE  rcvd: 75

H Emil

There are a few good historic discussions on this matter.

Review them here: https://community.letsencrypt.org/search?q=caa

There are, but usually something is obviously wrong with the domain’s DNS. This time it seems okay, as far as i can tell.

(I run an Unbound forwarder, but not an Unbound recursor, and not necessarily the same version.)

Hi @ahaw021

Yeah, I know. I have looked at them, but I doesn’t help me. A you can see there is no problem on my nameserver.

I wrote here to see if other have experienced the same and to get help from the Let’s Encrypt team to solve the issue.

I’m not seeing anything that should be causing a SERVFAIL either. The only issue I found is that ns1.srv1.dk returns a CAA record for srv1.dk, while the other name servers don’t:

dig -t TYPE257 srv1.dk @ns1.srv1.dk

; <<>> DiG 9.8.3-P1 <<>> -t TYPE257 srv1.dk @ns1.srv1.dk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16018
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;srv1.dk.			IN	TYPE257

;; ANSWER SECTION:
srv1.dk.		600	IN	TYPE257	\# 33 0005696F6465666D61696C746F3A6361612D7265706F727473407372 76312E646B
srv1.dk.		600	IN	TYPE257	\# 22 000569737375656C657473656E63727970742E6F7267

;; Query time: 38 msec
;; SERVER: 128.199.51.147#53(128.199.51.147)
;; WHEN: Sun Oct 16 16:38:41 2016
;; MSG SIZE  rcvd: 104

dig -t TYPE257 srv1.dk @ns2.srv1.dk

; <<>> DiG 9.8.3-P1 <<>> -t TYPE257 srv1.dk @ns2.srv1.dk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35430
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;srv1.dk.			IN	TYPE257

;; AUTHORITY SECTION:
srv1.dk.		600	IN	SOA	ns1.srv1.dk. dns.srv1.dk. 2016101502 14400 600 604800 600

;; Query time: 34 msec
;; SERVER: 5.79.70.116#53(5.79.70.116)
;; WHEN: Sun Oct 16 16:38:44 2016
;; MSG SIZE  rcvd: 69

dig -t TYPE257 srv1.dk @ns3.srv1.dk

; <<>> DiG 9.8.3-P1 <<>> -t TYPE257 srv1.dk @ns3.srv1.dk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44491
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;srv1.dk.			IN	TYPE257

;; AUTHORITY SECTION:
srv1.dk.		600	IN	SOA	ns1.srv1.dk. dns.srv1.dk. 2016101502 14400 600 604800 600

;; Query time: 143 msec
;; SERVER: 94.231.110.90#53(94.231.110.90)
;; WHEN: Sun Oct 16 16:38:46 2016
;; MSG SIZE  rcvd: 69

I don’t think this would cause a SERVFAIL, but it’s possibly something to look into.

@pfg There was issue in sync between the master and slaves. It is fixed now.

certbot is not failing anymore :slight_smile:

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