What is NetBIOS? Does Windows need its ports 137 and 138 open?
UDP port 137 (name services) UDP port 138 (datagram services) TCP port 139 (session services) NetBIOS over TCP/IP is specified by RFC 1001 and RFC 1002. The Netbt.sys driver is a kernel -mode component that supports the TDI interface.
Why would a Windows machine scan for port 137? - Super User
2018年3月21日 · The port 137 can be utilized by TCP or UDP. In this case, the "nbname" is used for the Name Service, name broadcasts for building browsing lists. 3 ports will be used in this case (NBT) and other ports 138, 139 have other responsibilities.
Does communication through UDP Port 137 always mean there is …
2012年5月31日 · No, you cannot assume all UDP/137 traffic is a port-scan; that could be legitimate NetBios over TCP/IP traffic. I have a corporate laptop from my employer, and I am unconnected to the corporate network behind my home firewall.
Incoming port 137 problem - Sophos Community
Incoming port 137 problem emoore over 15 years ago There is an online MMORPG game, "Chronicles of Spellborn", that when launched on a machine on the LAN, is trying to create an incoming connection to the internal address of the firewall using UDP port 137.
What the heck is going on, udp port 137 - Sophos Community
2010年11月16日 · Astaro v8.03, Tons of packages blocked from my Computer 192.168.0.2 to the internal Lan 192.168.0.255 via the UDP 137. Port 137 is netbios. I don't understand what you mean by your computer to the internal LAN. Where is your computer in the setup.
"Dropping" NETBIOS Port 137 - Sophos Community
Using Astaro V7.103 My packet filter log continually shows that internal network packets to internal network on port 137 (NETBIOS) are being "dropped." I created a test filter to "allow" all ports open for internal network to internal network. Even when that filter is enabled, I still see the "dropped" packets.
What port or ports are used for File sharing in windows?
2022年12月10日 · If the server has NBT enabled, it listens on UDP ports 137, 138, and on TCP ports 139, 445. If it has NBT disabled, it listens on TCP port 445 only. And this site (archived) mentions: "In Windows 2000/XP/2003, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT. For this they use TCP port 445.
What ports do I have to open for SMB sharing? - Super User
2015年9月18日 · The ports are UDP\137-138 and TCP\137,139,445. Make sure NetBIOS over TCP is explicitly specified, and failing that, a WINS server may be helpful, but only do this if the router is in teh middle of your network. don't try to expose SMB over the internet. it just won't work. use an VPN or use web-safe technologies like SFTP\FTPS for remote file ...
Why does my firewall block outgoing TCP/UDP port 137 - Super …
2016年2月1日 · I've got a Draytek Vigor 2930 router which has a default xNetBios -> DNS which blocks "TCP/UDP, Port: from 137~139 to 53~undefined".
NetBIOS packet probing (port 137). Does it come from the router?
2016年4月27日 · DST Port 137 (NetBIOS) packets coming from router's IP. Does the router have some weird "extras" with NetBIOS, or is it an outsider? Invalid unsolicited packets with !!??!! SRC Port=443, coming from various IP addresses, allocated to Google Inc. Can this …