Port 27000FlexNet License Server
Port 27000 is commonly associated with FlexNet Publisher, a software license management system used for controlling software usage across networks. It is part of a flexible port range (default usually 27000-27009) dedicated to managing license requests and coordination between client applications and license servers. This port facilitates communication that checks license availability, manages license check-in/check-out, and enforces licensing policies within organizational software deployments..
- transport
- tcp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 11,041
single transport
payload readable on path
used by convention
caution
rank 388 of 993 · top 39%
1 other service is registered on port 27000. compare all 2 →
Technical Details
what runs on :27000FlexNet Publisher (formerly FLEXlm) is a license management solution used extensively by software vendors to enforce and administer licensing terms. Port 27000 falls within its default dynamic license port block typically ranging from 27000 to 27009, which is used for communication between FlexNet’s license daemons and licensed client applications. When a client initiates a software instance, it sends a license checkout request over these ports to the license server.
The license server coordinates multiple FLEX-enabled applications across an enterprise. Communication over port 27000 primarily involves validating license entitlements, returning usage status, and handling feature-specific license tokens. The license manager daemon listens on port 27000 to coordinate activity, while vendor daemons assigned specific ports handle the actual license fulfillment and policy enforcement.
This setup allows for centralized control of software licensing, facilitating metrics collection, license pool optimization, and ensuring compliance. Organizations deploying FlexNet license servers configure this port range during server setup, though some configurations might customize or firewall off certain ports within the default range for tighter control.
Security Information
exposure of :27000risk 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
tcp
every listening transport is another surface to filter at the edge
security overview
Common vulnerabilities:
- Unauthorized access: If license servers are exposed externally or across untrusted internal networks, attackers may attempt to manipulate license validation for unauthorized software use.
- Denial of Service attacks: Since license availability is managed via this port, attackers targeting it can disrupt software deployments by overwhelming or disabling the server.
- Lack of encryption: As default communication is typically unencrypted, sensitive data about licenses could be intercepted via packet capture.
Common mitigations:
- Deploy access controls including network segmentation and firewall rules to restrict access strictly to trusted subnets and hosts.
- Enable encryption options available with FlexNet Publisher, such as SSL, to secure communications.
- Regularly update and patch your FlexNet Publisher components to address any discovered vulnerabilities.
- Monitor network traffic on port 27000 and set up alerts for anomalous access attempts or connection spikes.
- Use strong authentication and limit administrative access to the license server environment.
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risk mix of the 8 listed
- caution100%
0 of 8 encrypted