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Port 20720Symantec i3 Web GUI

Symantec i3 Web GUI Server provides a browser-based management interface for the Symantec i3 performance monitoring suite, facilitating administrators to manage, configure, and monitor applications in real time..

inWeb ServicesNetwork Services
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
5,642

rank 867 of 993 · top 87%

Technical Details

what runs on :20720

Symantec i3 Web GUI Server runs on TCP port 20720, delivering a web-based interface used alongside Symantec's i3 Suite. The i3 platform is designed for application performance management, allowing users to collect, analyze, and visualize performance data across distributed systems. The web GUI facilitates these operations by presenting monitoring dashboards, system health indicators, and configuration tools via a browser.

Communication through this port enables HTTP or potentially HTTPS (if configured) traffic, granting remote access to the management console. This interface serves as the main point of interaction for IT administrators overseeing application environments, enabling fine-tuned troubleshooting and performance optimization.

The service typically expects only authorized users to connect, and may be integrated within corporate networks or data centers. Due to its management-critical nature, it is often restricted to internal access via network segmentation and firewall controls.

Security Information

exposure of :20720

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

unofficial

used by convention, not registered — what answers here varies by deployment

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

Common Vulnerabilities:

  • Weak or default credentials on the management interface that may allow unauthorized access.
  • Potential lack of encryption leading to interception of credentials or session hijacking.
  • Exploitable web vulnerabilities such as cross-site scripting (XSS) or injection attacks against the web UI.
  • Exposure of the port to untrusted networks increasing the attack surface for brute-force attacks or reconnaissance.

Common Mitigations:

  • Enforce strong, unique credentials and multi-factor authentication.
  • Restrict access to trusted IP ranges or via VPN.
  • Enable encryption (HTTPS) if supported to secure data in transit.
  • Keep the Symantec i3 platform updated with security patches.
  • Perform regular vulnerability assessments and monitor access logs for suspicious activity.
  • Implement network firewall rules that limit port 20720 exposure only to authorized management stations.

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