Windows ignores ICMP:Destination Unreachable
There are sites whose firewalls reject forbidden tcp connections with ICMP:Destination Unreachable. If I try to connect from a Linux box, it fails immediately:
# this is a real site
$ exec 4>/dev/tcp/home.mcom.com/1234
-bash: connect: No route to host
-bash: /dev/tcp/home.mcom.com/1234: No route to host
tcpdump:
18:32:41.775714 IP 10.82.206.24.49780 > 199.48.144.24.1234: Flags [S], seq 2956496710, win 29200, options [mss 1460,sackOK,TS val 38649463 ecr 0,nop,wscale 4], length 0
18:32:41.959591 IP 199.48.144.24 > 10.82.206.24: ICMP host 199.48.144.24 unreachable - admin prohibited, length 68
However, if I try to connect from Windows 7, it keeps sending SYN packets until the connection timeout, ignoring the ICMP answers.
Wireshark shows that the ICMP packets do arrive. I tried to disable Windows Firewall, but it didn't help.
Is this by design?
windows-7 windows networking tcpip
asked Dec 16 at 18:36
basin
260312
add a comment |
There are sites whose firewalls reject forbidden tcp connections with ICMP:Destination Unreachable. If I try to connect from a Linux box, it fails immediately:
# this is a real site
$ exec 4>/dev/tcp/home.mcom.com/1234
-bash: connect: No route to host
-bash: /dev/tcp/home.mcom.com/1234: No route to host
tcpdump:
18:32:41.775714 IP 10.82.206.24.49780 > 199.48.144.24.1234: Flags [S], seq 2956496710, win 29200, options [mss 1460,sackOK,TS val 38649463 ecr 0,nop,wscale 4], length 0
18:32:41.959591 IP 199.48.144.24 > 10.82.206.24: ICMP host 199.48.144.24 unreachable - admin prohibited, length 68
However, if I try to connect from Windows 7, it keeps sending SYN packets until the connection timeout, ignoring the ICMP answers.
Wireshark shows that the ICMP packets do arrive. I tried to disable Windows Firewall, but it didn't help.
Is this by design?
windows-7 windows networking tcpip
asked Dec 16 at 18:36
basin
260312
add a comment |
There are sites whose firewalls reject forbidden tcp connections with ICMP:Destination Unreachable. If I try to connect from a Linux box, it fails immediately:
# this is a real site
$ exec 4>/dev/tcp/home.mcom.com/1234
-bash: connect: No route to host
-bash: /dev/tcp/home.mcom.com/1234: No route to host
tcpdump:
18:32:41.775714 IP 10.82.206.24.49780 > 199.48.144.24.1234: Flags [S], seq 2956496710, win 29200, options [mss 1460,sackOK,TS val 38649463 ecr 0,nop,wscale 4], length 0
18:32:41.959591 IP 199.48.144.24 > 10.82.206.24: ICMP host 199.48.144.24 unreachable - admin prohibited, length 68
However, if I try to connect from Windows 7, it keeps sending SYN packets until the connection timeout, ignoring the ICMP answers.
Wireshark shows that the ICMP packets do arrive. I tried to disable Windows Firewall, but it didn't help.
Is this by design?
windows-7 windows networking tcpip
asked Dec 16 at 18:36
basin
260312
There are sites whose firewalls reject forbidden tcp connections with ICMP:Destination Unreachable. If I try to connect from a Linux box, it fails immediately:
# this is a real site
$ exec 4>/dev/tcp/home.mcom.com/1234
-bash: connect: No route to host
-bash: /dev/tcp/home.mcom.com/1234: No route to host
tcpdump:
18:32:41.775714 IP 10.82.206.24.49780 > 199.48.144.24.1234: Flags [S], seq 2956496710, win 29200, options [mss 1460,sackOK,TS val 38649463 ecr 0,nop,wscale 4], length 0
18:32:41.959591 IP 199.48.144.24 > 10.82.206.24: ICMP host 199.48.144.24 unreachable - admin prohibited, length 68
However, if I try to connect from Windows 7, it keeps sending SYN packets until the connection timeout, ignoring the ICMP answers.
Wireshark shows that the ICMP packets do arrive. I tried to disable Windows Firewall, but it didn't help.
Is this by design?
windows-7 windows networking tcpip
windows-7 windows networking tcpip
asked Dec 16 at 18:36
basin
260312
asked Dec 16 at 18:36
basin
260312
asked Dec 16 at 18:36
basin
260312
asked Dec 16 at 18:36
basin
260312
asked Dec 16 at 18:36
basin
260312
260312
add a comment |
add a comment |
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