Raw UDP Socket and ICMP Destination (Port) Unreachable
Re: FTP Get: ICMP Port unreachable So the question is one of using the ftp client on Microsoft Windows Vista to perform an ftp get from a server box running the OpenVMS I64 V8.3-1H1 software, and the ftp client on Windows Vista is tossing ICMP errors? Icmp’s unreachable packets are used when a destination to a specific network, host, protocol, or port is unreachable. The router or host may send a destination unreachable packet to inform its source of the ip packets destinations unavailability. Jan 27, 2015 · I am currently blocking port 80: iptables -A INPUT -p tcp --destination-port 80 -j DROP What I was wondering, if I use the REJECT below, is a message [SOLVED] --reject-with icmp-port-unreachable question Doing a tcpdump on the originator ( x.x.x.122 a Linux machine) of the ICMP reply I notice that a DNS query request is sent, and after some time, the DNS server replies. Immediately upon the reply the Linux server sends a message that the port is unreachable back to the DNS server. Please see below: When I first got the Windows message "Scanner unreachable", I tried unplugging the power cord and plugging it back in, but the scanner was still 'unreachable'. I also tried unplugging the USB cable and plugging it back in, but still no scanner. I also tried plugging the USB cable into another USB port on my PC, but no scanner. Nov 01, 2016 · Cloning into '
networking - "Destination port unreachable" when pinging
ICMP destination unreachable to DNS server? - posted in General Technical Questions: In the process of tuning our firewall configuration Ive noticed our Barracuda is sending ICMP destination unreachable messages (type 3, code 3) to the DNS servers that its configured for. Why would it do this?I could understand if it was sending these messages to a host that it was trying to relay for, but we vCenter 6.7 generating ICMP port unreachable fo |VMware Roughly 15% of the time, they will generate a query the same second with the same source port to both the primary and secondary DNS servers. When this happens, the firewall logs that the vCenter server responds to the secondary DNS server's answer with an ICMP type 3 code 3 (port unreachable). Personal blog page of Gary Hoffman, opinions are my own and not the views of my employer.
R3 will reply with a type 3 destination unreachable message. Take a close look at the type and code. The type tells us the destination is unreachable. This could mean that the remote host or network is unreachable. However, the code is number 3 which means port unreachable. R3 uses this code because nothing is listening on UDP port 33435.
Personal blog page of Gary Hoffman, opinions are my own and not the views of my employer.