Port 3864Aggregate Server Access Protocol over TLS

ASAP over TLS carries Reliable Server Pooling registration and server-pool access traffic over TCP.

transport: tcp
in transit: encrypted
assignment: official
risk: 2/10
lookups: 0

also known as asap-tcp-tls, ASAP over TLS, ASAP

1 other service is registered on port 3864. compare all 2 →

Technical Details

what runs on :3864

TCP port 3864 carries ASAP inside a TLS connection: the peers perform a TLS handshake first, then exchange ASAP's framed, parameter-based protocol messages. ASAP supports RSerPool functions including pool-element registration and server-pool handle resolution, between pool users, pool elements, and related RSerPool components. The corresponding non-TLS ASAP service is commonly associated with port 3863; this assignment specifically identifies the TLS-over-TCP variant, not HTTP or a generic TLS-wrapped application.

Security Information

exposure of :3864

risk 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 2.7 across 1,464 ports — this one sits 0.7 below.

in transit

encrypted

payloads are protected on the wire

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

TLS encrypts traffic on this port, but protection against impersonation depends on certificate validation and deployment policy. RSerPool control and discovery functions should generally be limited to trusted peers; exposing the service unnecessarily can invite protocol probing or attempts to manipulate pool registrations or resolution, especially where peer authorization is weak. The protocol is uncommon and has not been observed open in the cited scan data.

Record

iana registry entry

port: :3864
service: Aggregate Server Access Protocol over TLS
transport: TCP
encryption: tls / encrypted
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port is for ASAP, the Aggregate Server Access Protocol used by the Reliable Server Pooling (RSerPool) architecture. RSerPool implementations use it for operations such as registering pool elements and resolving server-pool handles; it is a niche protocol, not a commonly encountered general-purpose service.
lookups: 0rank 993
added: 2026-10-02
updated: 2026-10-02
references: IANA service name registry — port 3864
RFC 5352

Something wrong?

This record is maintained by the engineers who use port 3864. 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 2026-10-02.

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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3864Aggregate Server Access Protocol over TLS

Technical Details

Security Information

Related Ports

Port 3864Aggregate Server Access Protocol over TLS