03-04-2019
I would add:-
- Possible router/firewall issues
- Excessive server load (either CPU meaning it never fully connected or too much network traffic leaving it unable to respond)
- DNS lookup failure, i.e. the DNS used by the server went off and the timeout was too long to allow the connection. The server will try to reverse lookup your connection for logging.
- Client side issue perhaps?
It's all a bit vague so I can only be vague in suggestions.
Robin
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FPDNS(1p) User Contributed Perl Documentation FPDNS(1p)
NAME
fpdns - DNS server fingeprinting tool
SYNOPSIS
fpdns [ -c ] [ -d ] [ -f ] [ -F nchild ]
[ -p port ] [ -Q srcaddr ] [ -r retry ]
[ -s ] [ -S separator ] [ -t timeout ] [ -v ] [server(s)]
DESCRIPTION
fpdns is a program that remotely determines DNS server versions. It does this by sending a series of borderline DNS queries which are
compared against a table of responses and server versions.
False positives or incorrect versions may be reported when trying to identify a set of servers residing behind a load-balancing apparatus
where the servers are of different implementations, when a specific implementation behaves like a forwarder, behind a firewall without
statefull inspection or without Application Intelligence.
OPTIONS
-c Where appropriate check CH TXT version. Off by default.
-d Enable debugging. Off by default.
-D Check all authoritative servers of the specified domain name.
-f Force checking of CH TXT version. Off by default.
-F nchild
Maximum number of forked child processes. Defaults to 10.
-p port
Port to query remote nameserver on. Default is 53.
-Q srcaddr
Set the source IP address to use.
-r retry
Number of attempt to retry fingerprints. Defaults to 1.
-s Short display form. Useful for surveys.
-S Separator. Defaults to " ".
-t timeout
Set the query timeout in seconds. Defaults to 5.
-T Use TCP instead of UDP.
-v Show version of fpdns.
server
IP address or name to query. Alternatively may be '-' to read from a list of these from stdin
AUTHORS
fpdns was written by Roy Arends and Jakob Schlyter.
SEE ALSO
perl(1), Net::DNS(1)
perl v5.14.2 2012-03-10 FPDNS(1p)