Port 4063ZeroC Glacier2

ZeroC Glacier2 routes Ice application traffic through a firewall, commonly listening on TCP port 4063.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as ice-router, Ice Firewall Traversal Service

Technical Details

what runs on :4063

Glacier2 uses the Ice middleware protocol, whose binary messages are carried over Ice connections. Its conventional endpoint is TCP port 4063; although IANA lists both TCP and UDP, TCP is the normal transport for the router. Clients connect to Glacier2 and use its session and authorization mechanisms to reach permitted server-side objects without opening direct inbound connections to those servers. IceSSL can provide TLS, but encryption is not implicit on a plain TCP endpoint.

Security Information

exposure of :4063

risk score

5/ 10caution

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

security averages 3.1 across 366 ports — this one sits 1.9 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

Exposing Glacier2 makes an application gateway reachable from the internet. Authentication and permissions are intended to constrain access, but a misconfigured router can expose backend services, and unencrypted endpoints can expose credentials and application data to interception. Restrict access where practical and use IceSSL; do not expose it unless remote clients need it.

Record

iana registry entry

port: :4063
service: ZeroC Glacier2
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Security Network Services
usage: This is the conventional port for Glacier2, the firewall-traversal router in ZeroC Ice middleware. Ice clients connect to the router, which mediates access to Ice services behind a firewall; it is uncommon outside deployments using Ice.
lookups: 0rank 993
added: 2026-10-03
updated: 2026-10-03
references: IANA service name registry — port 4063

Something wrong?

This record is maintained by the engineers who use port 4063. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-03.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 366 in security →

the 8 most looked-up other ports in security — 366 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :4063ZeroC Glacier2

Technical Details

Security Information

Related Ports

Port 4063ZeroC Glacier2