Issue Plesk SLAVEDNS Troubleshooting Problem

[Consertis]

I am currently having problems getting my slave dns servers up and running.

First of all: Both servers are connected via BIND9 and are shown as green and working properly in the Plesk Dashboard.

But now I have the problem that somehow still no sync takes place. The SLAVE servers can not resolve the address:

; <<>> DiG 9.16.1-Ubuntu <<>> A sipvox.nex @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 3622
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 2a632a1079420611010000625964cd96d1492d2742b8bd (good)
;; QUESTION SECTION:
;sipvox.nex. IN A

;; query time: 3927 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Apr 15 12:27:57 UTC 2022
;; MSG SIZE rcvd: 67


However, it works fine on the Plesk server itself:

; <<>> DiG 9.16.1-Ubuntu <<>> A sipvox.net @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26618
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: ; udp: 4096
; COOKIE: 35a2b43eab2e911d010000625966009f0a806e707f2a3c (good)
;; QUESTION SECTION:
;sipvox.net. IN A

;; ANSWER SECTION:
sipvox.net. 86400 IN A 212.232.26.248

;; query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Apr 15 12:33:04 UTC 2022
;; MSG SIZE rcvd: 83

I don't know what to do anymore.

In the firewall all ports are opened correctly (port: 53 for DNS).

I think somehow the transfer of the adresses dont work properly, but i cant say if im right or not.
I am grateful for any help !

 

[Consertis]

Apr 15 12:51:36 tu2040 named[43203]: validating ./NS: no valid signature found
Apr 15 12:51:36 tu2040 named[43203]: no valid RRSIG resolving './NS/IN': 192.33.4.12#53
Apr 15 12:51:36 tu2040 named[43203]: validating ./NS: no valid signature found
Apr 15 12:51:36 tu2040 named[43203]: no valid RRSIG resolving './NS/IN': 199.7.83.42#53
Apr 15 12:51:36 tu2040 named[43203]: validating ./NS: no valid signature found
Apr 15 12:51:36 tu2040 named[43203]: no valid RRSIG resolving './NS/IN': 192.5.5.241#53
Apr 15 12:51:36 tu2040 named[43203]: resolver priming query complete
Apr 15 12:51:40 tu2040 named[43203]: validating net/DS: no valid signature found
Apr 15 12:51:40 tu2040 named[43203]: broken trust chain resolving 'sipvox.net/A/IN': 212.232.26.248#53
Apr 15 12:52:05 tu2040 named[43203]: managed-keys-zone: DNSKEY set for zone '.' could not be verified with current keys

Bind shows this as Error Message when typing in the command: sudo service bind9 status