Ping from the host is OK though. I try to gain some hints by capturing packets on the VirualBox-Host-Only-Network adapter with wireshark. And I see some ICMP packets sent from to which tell me "Destination unreachable (Host administratively prohibited)".

Hi all, I'm new here so hope this question is understandable enough. I was advised by a game server admin that there was an additional connection connecting in association with my own IP from which was causing issues with the server. We … destination unreachable – IT Wiz Technology Blog 0 – Network is unreachable. 1 – Host is unreachable (telnet to unknown ip address on an existing interface) 2 – Protocol unreachable. 3 – Port unreachable (use cisco trace route probe 1) 4 – Fragmentation need but DF set. 5 – Source Routing. 6 – 8 – unknown errors. 9, 10, 13 – Admin Prohibited (telnet an interface with access Internet Control Message Protocol (ICMP) Parameters IESG Approval or Standards Action 0 Net Unreachable 1 Host Unreachable 2 Protocol Unreachable 3 Port Unreachable 4 Fragmentation Needed and Don't Fragment was Set 5 Source Route Failed 6 Destination Network Unknown 7 Destination Host Unknown 8 Source Host Isolated 9 Communication with Destination Network is Administratively Prohibited 10 ping (networking utility) - Wikipedia

Code 12 - Host unreachable for TOS - If your packet was unable to reach a host because of the TOS of the packet, this is the message you get back. Code 13 - Communication administratively prohibited by filtering - If the packet was prohibited by some kind of filtering (e.g., firewalling), we get a code 13 back.

[Router Products] Error message IP address unreachable in

The original codes were defined in RFC 777 ICMP but more were defined in RFC 1812 Host Requirements, including reason 13 "Administratively Prohibited". If you get any variety of ICMP destination unreachable, it means the far router is telling you it didn't forward the packet, and the code inside is just intended to help you understand why.

[SOLVED] Destination host unreachable - CentOS Aug 04, 2011 1.1.d (i) ICMP Unreachables, and Redirects – Techstat