whatportis.com
suggest an edit →

Port 1431Reverse Gossip Transport Protocol (RGTP)

RGTP is a protocol designed to facilitate access to the General-purpose Reverse-Ordered Gossip Gathering System (GROGGS), a bulletin board service initially developed at Cambridge University. It allows users to retrieve, post, and manage discussion threads in a reverse chronological order, maximizing the relevance of recent gossip messages within the academic community's Phoenix system..

inWeb ServicesSystem
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
3/10

caution

lookups
27,314

rank 53 of 993 · top 5%

Technical Details

what runs on :1431

Overview:

Reverse Gossip Transport Protocol (RGTP) is a specialized communications protocol used primarily to interact with the GROGGS bulletin board system. Developed as part of the Cambridge University Phoenix system, RGTP enables a client-server architecture where users can connect to read or post messages. The unique feature of GROGGS is its reverse-chronological message ordering, prioritized by recency rather than topic threads.

Protocol Functionality:

RGTP leverages TCP transport to provide reliable, ordered delivery of messages between clients and the GROGGS server. It supports fundamental commands such as fetch messages, post messages, search discussions, and navigate categories. GRTP's design prioritizes low overhead and simplicity, well-suited for academic network infrastructures of its time.

Implementation Context:

Originally, RGTP was implemented within Cambridge's local university network, featuring tight integration with user authentication and access policies specific to higher education environments. Due to its bespoke nature, RGTP saw minimal adoption outside this context, making its deployment relatively rare today. There is no widely adopted standard beyond its initial implementation.

Security Information

exposure of :1431

risk score

3/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

web services averages 3.9 across 112 ports — this one sits 0.9 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

Common Vulnerabilities:

  • Given RGTP's historical academic focus, it often lacks modern authentication mechanisms, leaving systems susceptible to unauthorized access if left exposed externally.
  • The absence of encryption can lead to traffic interception and information leakage.
  • Potential for buffer overflow or injection attacks if implementations fail to sanitize inputs.

Mitigations:

  • Restrict RGTP service access behind institutional firewalls and VPNs, limiting exposure to trusted users.
  • Employ network segmentation so only relevant hosts within the academic environment reach the service.
  • Deploy monitoring for abnormal activity and audit logs regularly.
  • If possible, wrap RGTP communications within encrypted tunnels such as SSH port forwarding.
  • Harden server and client implementations to handle malformed inputs gracefully.

Related Ports

all 112 in web services →

the 8 most looked-up other ports in web services — 112 ports carry that label.

portservicerisk
:8888Sun Answerbook & Alt HTTPcaution
:8000Intel Remote Desktop / Alternate HTTP Portsafe
:8888NewsEDGEcaution
:8888HTTP Alternative Portcaution
:8888GNUmp3d Streaming HTTPcaution
:9080Groove RPCcaution
:8881Atlasz Secure Servercaution
:80HTTPcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

0 of 8 encrypted