Port 1550Gadu-Gadu C2C
Port 1550 is used for Gadu-Gadu's direct client-to-client (C2C) connections, facilitating peer-to-peer communication within this popular Polish instant messaging service. This port assists clients in bypassing centralized servers to establish direct connections for file transfers or conversations..
- transport
- unknown
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 7,650
single transport
payload readable on path
used by convention
caution
rank 668 of 993 · top 67%
Technical Details
what runs on :1550Overview: Gadu-Gadu is a well-known Polish instant messaging platform, which utilizes various ports for its operations. Port 1550 is specifically recognized for enabling direct client-to-client communication, bypassing intermediary servers. This facilitates efficient peer-to-peer data transfer, such as file sharing and direct chat sessions.
Protocol Characteristics: The port isn’t officially registered with IANA, and both TCP and UDP are typically not required; instead, it may employ custom connection methods, sometimes leveraging NAT traversal or proxying for client linkage. Since the legacy data indicates neither TCP nor UDP, the communication protocol might be proprietary, encapsulated, or negotiated dynamically.
Deployment Considerations: Due to the peer-to-peer nature, direct communication over this port can be beneficial in reducing latency and easing server loads. However, this also requires appropriate NAT or firewall configurations to permit such direct links, potentially complicating network architecture.
Security Information
exposure of :1550risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
network services averages 3.9 across 604 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
unknown
every listening transport is another surface to filter at the edge
security overview
Common Vulnerabilities:
- Lack of Encryption: Communications over port 1550 are typically unencrypted, exposing chat content and file transfers to eavesdropping.
- Impersonation Attacks: Without robust authentication, malicious actors might impersonate users or inject malicious payloads.
- Abuse for Malware or Spam: Malicious content can be distributed under the guise of legitimate file transfers.
Common Mitigations:
- Use of Encrypted Messaging: Encourage end-to-end encryption or switch to secure messaging alternatives.
- Strict Firewall Rules: Limit or block unsolicited inbound connections on this port to prevent abuse.
- User Authentication: Implement strong authentication schemes within the messaging client.
- Monitoring and Logging: Regularly monitor port activity to detect unusual behaviors or intrusion attempts.
- Client Updates: Ensure messaging clients are regularly updated to patch known vulnerabilities.
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| :3268 | Microsoft Global Catalog (GC) | TCPUDP | Security | caution | 54.6k |
| :135 | Microsoft EPMAP | TCPUDP | Security | caution | 51.9k |
| :3128 | Tatsoft Default HTTP Proxy | TCP | Web Services | caution | 46.8k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted