Port 8787RStudio Server

RStudio Server's browser-based R development environment commonly listens on TCP 8787; the IANA assignment is Message Server.

inWeb Services Remote Access

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 7/10
lookups: 0

also known as msgsrvr, Posit Workbench

Technical Details

what runs on :8787

RStudio Server commonly listens on TCP 8787 and serves a browser-based interface for editing and running R code on the host. Its default web access is HTTP; deployments can configure TLS or place it behind a TLS-terminating reverse proxy. Although IANA lists both TCP and UDP for msgsrvr, RStudio Server uses TCP, not UDP. This common use differs from the IANA “Message Server” assignment.

Security Information

exposure of :8787

risk score

7/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

web services averages 3.2 across 224 ports — this one sits 3.8 above.

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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

An exposed RStudio Server login gives authenticated users an interactive development environment and the ability to run code with their account's permissions on the host. Avoid exposing it directly to the internet when possible; restrict access with a VPN or trusted reverse proxy, use strong authentication, and keep the server updated. Default HTTP does not encrypt traffic, so use TLS for connections across untrusted networks.

Record

iana registry entry

port: :8787
service: RStudio Server
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 7/10risk
category: Web Services Remote Access
usage: Engineers commonly encounter TCP 8787 as the default web interface for RStudio Server, now part of Posit's product line. IANA separately assigns the name msgsrvr, “Message Server,” to Michael O Brien; that assignment does not describe the common RStudio use.
lookups: 0rank 993
added: 2026-10-14
updated: 2026-10-14
references: IANA service name registry — port 8787

Something wrong?

This record is maintained by the engineers who use port 8787. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-14.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 224 in web services →

the 8 most looked-up other ports in web services — 224 ports carry that label.

port	service	proto	category	risk	views
:8888	Sun Answerbook & Alt HTTP	TCP	Web Services	caution	123.9k
:8000	Intel Remote Desktop / Alternate HTTP Port	TCP	Web Services	safe	84.3k
:8888	NewsEDGE	TCPUDP	Web Services	caution	83.3k
:8888	HTTP Alternative Port	TCP	Web Services	caution	76.5k
:8888	GNUmp3d Streaming HTTP	TCP	Web Services	caution	76.3k
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:80	HTTP	TCPUDP	Web Services	caution	67.3k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :8787RStudio Server

Technical Details

Security Information

Related Ports

Port 8787RStudio Server