whatportis.com
suggest an edit →

Port 591FileMaker Web Sharing

Port 591 is commonly used by FileMaker's Web Publishing feature as an alternate HTTP port, allowing clients to access FileMaker databases via a web browser. It serves as an alternative to the standard port 80 for providing data-driven web interfaces directly from within FileMaker Server, enabling developers and users to publish, view, and interact with database content easily over the network..

inWeb ServicesDatabases
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
4/10

caution

lookups
23,119

rank 87 of 993 · top 9%

Technical Details

what runs on :591

  • Purpose & Use: Port 591 is primarily associated with FileMaker Pro and FileMaker Server's Web Publishing Engine, introduced in FileMaker 6.0 and later versions. It enables access to FileMaker databases over the web without the need for an external web server, serving HTML pages, XML data, and facilitating web-based interactions.

  • Alternate HTTP Port: While port 80 is the default for HTTP traffic, FileMaker utilizes port 591 as an alternate to avoid conflicts with other web services running on port 80. This alternate port enables the built-in web server to run concurrently with other HTTP services, offering flexibility during deployment and configuration.

  • Protocols & Data Flow: The service operates over TCP, supporting standard HTTP requests, custom FileMaker web publishing protocols, and often integrates with XML or PHP gateways. It does not inherently provide encryption; additional security measures like SSL/TLS should be configured externally if encryption is required.

Security Information

exposure of :591

risk score

4/ 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 0.1 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

every listening transport is another surface to filter at the edge

security overview

  • Common Vulnerabilities:

    • Lack of Encryption: Since communications over port 591 are unencrypted by default, data, including sensitive database content or credentials, is susceptible to interception or eavesdropping.
    • Exposure of Sensitive Data: Improper configuration may unintentionally expose database records or administrative pages to unauthorized users.
    • Known Exploits: Attackers might leverage outdated FileMaker server versions' vulnerabilities to execute code remotely, manipulate queries, or perform denial-of-service attacks.

  • Mitigations:

    • Enable Encryption: Protect communication using SSL/TLS by reverse proxying or enabling secure channels.
    • Restrict Access: Use firewall rules to limit who can reach port 591 and employ authentication controls within FileMaker.
    • Keep Software Updated: Regularly patch FileMaker software to close known security holes.
    • Harden Configuration: Disable anonymous access, apply least privilege principles, and audit accessible endpoints.

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