Port 1533IBM Sametime & SQL Server
Port 1533 is primarily known for IBM Sametime, which is an enterprise instant messaging and collaboration platform, as well as some communication with Microsoft SQL Server components. It facilitates virtual meetings, rich media chat, and integration with various enterprise tools that support real-time messaging and presence information..
- transport
- tcp
- in transit
- cleartext
- assignment
- official
- risk
- 2/10
- lookups
- 13,526
single transport
payload readable on path
registered with iana
safe
rank 269 of 993 · top 27%
Technical Details
what runs on :1533Port 1533 is officially assigned by IANA for IBM Sametime (formerly known as Virtual Places), an enterprise messaging suite that provides instant messaging, presence awareness, and meeting capabilities. IBM Sametime uses this port to establish chat sessions and facilitate real-time communication between clients and the Sametime server infrastructure.
This port is utilized primarily over TCP for session initialization and message exchange. Within an enterprise environment, multiple components of Sametime — including messaging, conferencing, and presence services — rely on traffic over port 1533 for initial login, authentication negotiation, and ongoing chat streams. The port may also be used indirectly during integrations with other collaborative or directory services.
Aside from Sametime, port 1533 can also be associated with Microsoft SQL Server when used in custom configurations or by specific connectors. However, this is less common and typically specific to hybrid deployments where chat services interact with database components.
Security Information
exposure of :1533risk score
2/ 10safe
routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.
network services averages 3.9 across 604 ports — this one sits 1.9 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:
- Unauthorized access if authentication is improperly configured, leading to data leakage or exposure of internal messaging.
- Exploitation of legacy cipher suites during connections lacking encryption.
- Man-in-the-middle attacks when traffic is unencrypted, allowing interception of chat messages or credentials.
- Abuse by malware or insiders to exfiltrate sensitive information using chat protocols.
Common mitigations:
- Employ strong authentication mechanisms such as LDAP integration with 2FA to restrict access.
- Enforce network segmentation and firewall rules restricting port 1533 only between trusted Sametime clients and servers.
- Enable encryption capabilities in Sametime where available or tunnel traffic over secure VPN connections.
- Regularly audit and patch the Sametime server and related systems to close vulnerabilities.
- Monitor network traffic over this port for unusual spikes or unauthorized connection attempts.
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| :3128 | Tatsoft Default HTTP Proxy | TCP | Web Services | caution | 46.8k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted