I have setup a bind9 dns server on virtualmin and created dns zone for following domain with following nameservers.
domain = thecrystalsms.com Name Server ns5.crystalhost.net ns6.crystalhost.net
Both ns5 and ns6 are resolving correctly to 182.93.78.27
And in my server when I run following command
host -t ns thecrystalsms.com
it shows
thecrystalsms.com name server ns6.crystalhost.net.
thecrystalsms.com name server ns5.crystalhost.net.
But when I query dns fro thecrystalsms.com from outside it fails.
Following is my dns zone entries
$ttl 38400
@ IN SOA ns5.crystalhost.net. root.ns5.crystalhost.net. (
1559739241
10800
3600
604800
38400 )
@ IN NS ns5.crystalhost.net.
@ IN NS ns6.crystalhost.net.
thecrystalsms.com. IN A 182.93.78.27
www.thecrystalsms.com. IN A 182.93.78.27
ftp.thecrystalsms.com. IN A 182.93.78.27
m.thecrystalsms.com. IN A 182.93.78.27
localhost.thecrystalsms.com. IN A 127.0.0.1
webmail.thecrystalsms.com. IN A 182.93.78.27
admin.thecrystalsms.com. IN A 182.93.78.27
mail.thecrystalsms.com. IN A 182.93.78.27
thecrystalsms.com. IN MX 5 mail.thecrystalsms.com.
thecrystalsms.com. IN TXT "v=spf1 a mx a:thecrystalsms.com ip4:182.93.78.27 ip4:182.93.78.27 ip6:fe80::250:56ff:fe8c:d4ad -all"
_dmarc.thecrystalsms.com. IN TXT "v=DMARC1; pct=100; ruf=mailto:postmaster@thecrystalsms.com; rua=mailto:postmaster@thecrystalsms.com; p=reject"
Could not understand what is the issue.
Restarted server for multiple times too.
Output of netstat -an|grep :53 gives
tcp 0 0 182.93.78.27:53 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
tcp6 0 0 :::53 :::* LISTEN
udp 0 0 182.93.78.27:53 0.0.0.0:*
udp 0 0 127.0.0.1:53 0.0.0.0:*
udp6 0 0 :::53 :::*
Port Scanner Results
Not shown: 840 closed ports, 142 filtered ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop3
143/tcp open imap
443/tcp open https
465/tcp open smtps
587/tcp open submission
993/tcp open imaps
995/tcp open pop3s
2222/tcp open unknown
8000/tcp open http-alt
8001/tcp open unknown
8002/tcp open teradataordbms
10000/tcp open snet-sensor-mgmt
20000/tcp open unknown
Nmap done: 1 IP address (1 host up) scanned in 20.40 seconds
I ran zenmap tool and found following result
nmap -sS -sU -T4 -A -v thecrystalsms.com
Starting Nmap 7.70 ( https://nmap.org ) at 2019-06-11 12:02 Nepal Standard Time
NSE: Loaded 148 scripts for scanning.
NSE: Script Pre-scanning.
Initiating NSE at 12:02
Completed NSE at 12:02, 0.00s elapsed
Initiating NSE at 12:02
Completed NSE at 12:02, 0.00s elapsed
Initiating Ping Scan at 12:02
Scanning thecrystalsms.com (182.93.78.27) [4 ports]
Completed Ping Scan at 12:02, 0.75s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 12:02
Completed Parallel DNS resolution of 1 host. at 12:02, 0.01s elapsed
Initiating SYN Stealth Scan at 12:02
Scanning thecrystalsms.com (182.93.78.27) [1000 ports]
Discovered open port 443/tcp on 182.93.78.27
Discovered open port 995/tcp on 182.93.78.27
Discovered open port 80/tcp on 182.93.78.27
Discovered open port 21/tcp on 182.93.78.27
Discovered open port 53/tcp on 182.93.78.27
Discovered open port 143/tcp on 182.93.78.27
Discovered open port 993/tcp on 182.93.78.27
Discovered open port 587/tcp on 182.93.78.27
Discovered open port 22/tcp on 182.93.78.27
Discovered open port 110/tcp on 182.93.78.27
Discovered open port 10000/tcp on 182.93.78.27
Discovered open port 20000/tcp on 182.93.78.27
Discovered open port 8007/tcp on 182.93.78.27
Discovered open port 465/tcp on 182.93.78.27
Discovered open port 8002/tcp on 182.93.78.27
Discovered open port 8000/tcp on 182.93.78.27
Discovered open port 2222/tcp on 182.93.78.27
Completed SYN Stealth Scan at 12:02, 2.04s elapsed (1000 total ports)
Initiating UDP Scan at 12:02
Scanning thecrystalsms.com (182.93.78.27) [1000 ports]
Discovered open port 53/udp on 182.93.78.27
Increasing send delay for 182.93.78.27 from 0 to 50 due to max_successful_tryno increase to 5
Increasing send delay for 182.93.78.27 from 50 to 100 due to max_successful_tryno increase to 6
Warning: 182.93.78.27 giving up on port because retransmission cap hit (6).
UDP Scan Timing: About 31.30% done; ETC: 12:04 (0:01:08 remaining)
UDP Scan Timing: About 37.70% done; ETC: 12:05 (0:01:41 remaining)
Seem my server has udp port open too. Also, when I lookup ns via command line it shows following result
nslookup thecrystalsms.com 182.93.78.27
Server: UnKnown
Address: 182.93.78.27
Name: thecrystalsms.com
Address: 182.93.78.27
But when I run nslookup thecrystalsms.com 8.8.8.8 the response is
DNS request timed out.
timeout was 2 seconds.
Server: UnKnown
Address: 192.93.78.27
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-out
Couldn't figure out problem with bind9 or somewhere else.
