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Port 1677Novell GroupWise

Port 1677 is primarily used by Novell GroupWise for client/server communication, facilitating email messaging, calendaring, and other collaboration features. It supports both TCP and UDP protocols to maintain efficient connectivity between GroupWise clients and servers in a business environment..

inEmailNetwork Services
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
4/10

caution

lookups
7,527

rank 677 of 993 · top 68%

Technical Details

what runs on :1677

Port 1677 serves as a dedicated communication endpoint for Novell GroupWise, a messaging and collaboration platform historically favored within enterprise settings. GroupWise clients utilize this port in client/server mode to exchange data such as emails, calendar events, directory requests, and real-time updates.

Supporting both TCP and UDP protocols, this port ensures flexible connectivity. TCP provides reliable, connection-oriented communication essential for message delivery, while UDP handles lightweight, lower-overhead communications where appropriate within the GroupWise ecosystem. Bi-directional data exchange over this port allows seamless integration of various GroupWise modules with the core server components.

GroupWise systems rely heavily on port 1677 availability to function correctly. Network configurations, including firewall rules and NAT policies, must accommodate these communications to maintain full client/server interoperability. Proper network planning for this port ensures smooth operation of enterprise messaging workflows.

Security Information

exposure of :1677

risk score

4/ 10caution

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

email averages 3.9 across 42 ports — this one sits 0.1 above.

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 · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common vulnerabilities:

  • Exposure of port 1677 to untrusted networks can risk unauthorized access, including attempts to exploit known flaws in legacy GroupWise server versions.
  • Lack of encryption over this port can result in interception of sensitive data like credentials through packet sniffing.
  • Weak authentication or misconfigurations may facilitate privilege escalation or remote code execution attacks.

Common mitigations:

  • Limit exposure by restricting port 1677 to trusted internal network segments or via VPN tunnels.
  • Enforce strong authentication policies and regularly update GroupWise software to patch vulnerabilities.
  • Use network segmentation and firewall rules to control inbound/outbound access.
  • Whenever possible, encapsulate traffic with secure protocols or tunnels (e.g., SSL/TLS or IPsec) to protect data integrity and confidentiality.
  • Monitor port activity and audit server logs for anomaly detection and early incident response.

Related Ports

all 42 in email →

the 8 most looked-up other ports in email — 42 ports carry that label.

portservicerisk
:143IMAPcaution
:995POP3Scaution
:109POP2caution
:2096cPanel SSL Webmailsafe
:110POP3caution
:993IMAPScaution
:1352Lotus Notes RPCcaution
:24Private Mailcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

3 of 8 encrypted