Looking for information on Protocol TCP 111? This page will attempt to provide you with as much port information as possible on TCP Port 111.
TCP Port 111 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 111
Here is what we know about protocol TCP Port 111. If you have information on TCP port 111 that is not reflected on this page, simply leave a comment and we’ll update our information.
PORT 111 – Information
- Port Number: 111
- TCP / UDP: TCP
- Delivery: Yes
- Protocol / Name: sunrpc
- Port Description: Sun’s RPC Portmapper. Used to map non-registered rpc service ports on most Unix systems (Irix uses port 1). Security Concerns: Provides rpc port map w/o auth. – Has no filtering or logging. – Attacker rpcinfo probes quickly find your Unix hosts. – Solaris hosts open a second port above 32770. Attackers will scan for and use it, knowing net devices won’t watch & log this like 111 traffic. Enhance your portmapper to get ACL filtering and logging: BSD: Install \portmap wrapper\. – System V & Solaris: Install Venema’s \rpcbind replacement\. Both require libwrap.a from a compiled TCP Wrapper program. Shut down portmapper on any hosts not requiring rpc’s. Ensure blocked at all net perimeters.
- Virus / Trojan: No
Side note: TCP port 111 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 111 in the same order in which they were sent. Guaranteed communication over port 111 is the key difference between TCP and UDP. UDP port 111 would not have guaranteed communication in the same way as TCP.
Because protocol TCP port 111 was flagged as a virus (colored red) does not mean that a virus is using port 111, but that a Trojan or Virus has used this port in the past to communicate.
TCP 111 – Disclaimer
We do our best to provide you with accurate information on PORT 111 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!