TCP 139
TCP port 139 protocol information and warnings.
Looking for information on Protocol TCP 139? This page will attempt to provide you with as much port information as possible on TCP Port 139.
TCP Port 139 may use a defined protocol to communicate depending on the application. A protocol is a set of formalized rules that explains how data is communicated over a network. Think of it as the language spoken between computers to help them communicate more efficiently.
Protocol HTTP for example defines the format for communication between internet browsers and web sites. Another example is the IMAP protocol that defines the communication between IMAP email servers and clients or finally, the SSL protocol which states the format to use for encrypted communications.
TCP Port 139
Here is what we know about protocol TCP Port 139. If we do not have any information on port 139 in our database, a counter will be set for TCP port 139. After enough hits, we'll research this port and update the database.
If you have information on TCP port 139 that is not reflected in our database, please leave a comment or post your information on our Web Security Forum. We'll update our database so that the next user searching for port 139 will have the most accurate information.
PORT 139 - Information
| Port Number: | 139 |
| TCP / UDP: | TCP |
| Delivery: | Yes |
| Protocol / Name: | Sadmind Network SMBRelay Chode GodMessageworm Msinit Netlog netbios-ssn |
| Port Description: | Sadmind Network SMB Relay Chode God Message worm Msinit Netlog A principle rqmt for NetBIOS services on MS hosts (Win9x/ME/NT/Win2000). TCP 139 is used for directory replication, event viewer, file sharing, logon sequence, pass-thru validation, performance monitoring, printing, registry editor, server manager, trusts, user manager, WinNT Diagnostics, and WinNT Secure Channel.Security Concerns: Key target in auth & DOS attacks, plus sniffer capture of sensitive data transfers. Block at all perimeters; NIC-filter on public-exposed MS hosts |
| Virus / Trojan: | Yes, Caution! Use our free Anonymous Surfing and Firewall Test. |
Side note: TCP port 139 uses the Transmission Control Protocol. TCP is one of the main protocols in TCP/IP networks. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and also guarantees that packets will be delivered on port 139 in the same order in which they were sent. Guaranteed communication over port 139 is the key difference between TCP and UDP. UDP port 139 would not have guaranteed communication in the same way as TCP.
Because protocol TCP port 139 was flagged as a virus (colored red) does not mean that a virus is using port 139, but that a Trojan or Virus has used this port in the past to communicate.
TCP 139 - Disclaimer
We do our best to provide you with accurate information on PORT 139 and work hard to keep our database up to date. This is a free service and accuracy is not guaranteed. We do our best to correct any errors and welcome feedback!