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I want to check if I can connect to Rspamd's Fuzzy port and have a very strange problem - I can ping a the host and get an answer (0% packet loss). But when I try to telnet him, I get "No route to host":

# telnet 88.99.142.95 11335
Trying 88.99.142.95...
telnet: Unable to connect to remote host: No route to host

And the same with nc:

nc -vz 88.99.142.95 11335
mail.highsecure.ru [88.99.142.95] 11335 (?) : No route to host

Sure, at first glance this looks like a firewall problem, but refer to the following output (the firewall is completely off - better said, there are no blocking rules):

# iptables -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
# iptables -v -n -L
Chain INPUT (policy ACCEPT 98 packets, 6560 bytes)
 pkts bytes target     prot opt in     out     source               destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
Chain OUTPUT (policy ACCEPT 64 packets, 5736 bytes)
 pkts bytes target     prot opt in     out     source               destination

I'm on a server virtual machine with Debain 10.

Has anyone an idea where the problem might be?

3
  • This is your host firewall or target machine's one?
    – DevilaN
    May 28, 2020 at 13:59
  • @DevilaN - I'm trying to connect from a Server - there's no Firewall. And regarding the target machine - maybe.
    – manifestor
    May 28, 2020 at 14:59
  • So most probable answer here is that target machine firewall is blocking you.
    – DevilaN
    May 29, 2020 at 7:11

1 Answer 1

2

The target port is blocked by the target firewall (at least for your and my IP addresses).

If you run tcpdump -i any -n icmp then you see a host unreachable - admin prohibited ICMP packet.

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