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Port 2638Sybase Listener

Port 2638 is primarily used by the Sybase SQL Anywhere database server as a listener port for client communication. It enables database clients to establish a connection for data querying, management, and synchronization activities. The Sybase database listener port plays a critical role in enterprise environments where Sybase solutions support business applications requiring fast, reliable transactional database services..

inDatabases
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
7,814

rank 654 of 993 · top 66%

Technical Details

what runs on :2638

Port 2638 is the default listener port for Sybase SQL Anywhere (formerly Adaptive Server Anywhere). This database management system is designed to provide lightweight, embedded, or enterprise-class database capabilities and supports concurrent multi-user access. The listener service on this port coordinates connections from various Sybase client utilities and applications, handling authentication, session management, and SQL command forwarding.

The listener facilitates client/server communication using TCP/IP, ensuring queries and administrative commands are transmitted efficiently. It supports mechanisms like encrypted communication if configured to do so, although by default, traffic may be unencrypted. The SQL Anywhere server can be configured to listen on custom ports, but 2638 remains standard in many deployments, optimizing compatibility and ease of connection setup.

In clustered or replicated Sybase environments, port 2638 helps in managing synchronization tasks across multiple database nodes or remote clients. It is integral for mobile database solutions implemented by SQL Anywhere, designed to function both as a main server listener and as a gateway for synchronization with remote databases or clients.

Security Information

exposure of :2638

risk score

4/ 10caution

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

databases averages 4.0 across 58 ports — this one sits level with it.

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:

  • Lack of encrypted communication may expose sensitive data and authentication credentials during transit.
  • SQL injection vulnerabilities can arise if application inputs are poorly sanitized, leading to unauthorized data access or modification.
  • Brute-force attacks targeting authentication mechanisms may compromise database integrity.
  • Unpatched server vulnerabilities could be exploited for remote code execution or privilege escalation.

Mitigations:

  • Enable encryption (such as TLS) on database connections to protect data in transit.
  • Use strong authentication methods and enforce strong passwords, possibly integrating with directory services for centralized control.
  • Regularly update and patch the database server to address security flaws.
  • Implement strict input validation and parameterized queries within client applications to defend against SQL injection.
  • Employ network-level controls such as firewalls to restrict access to port 2638 to trusted hosts or networks.
  • Monitor database logs and connection attempts for suspicious activity.

Related Ports

all 58 in databases →

the 8 most looked-up other ports in databases — 58 ports carry that label.

portservicerisk
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:18206Audition FAM DBcaution

risk mix of the 8 listed

  • caution100%

1 of 8 encrypted