# WHATPORT(3871)

## NAME

port 3871 — Avocent DS Authorization (ADSAP2) — The port an Avocent/Vertiv DSView server uses to authorize a KVM session against the appliance the user is connecting to.

Protocol: TCP  
IANA: avocent-adsap

## DESCRIPTION

IANA registers 3871 as avocent-adsap, "Avocent DS Authorization". In Vertiv's DSView management software the server opens a TCP connection to the managed KVM or serial-console appliance on 3871 to authorize a user's session to a target device; appliances such as the AutoView switches expose it as the ADSAP2 port in their on-board web interface, where it can be turned off. You see it on data-centre KVM-over-IP switches, console servers, and rack appliances.

## EXPOSURE

**Do not expose.** This is out-of-band infrastructure: the appliances it fronts give console and keyboard access to servers, so both the appliance and 3871 belong on an isolated management network.

## CHECK

```sh
nc -vz TARGET 3871
```

## SEE ALSO

- docs — [Vertiv Avocent DSView 4.5 — TCP/UDP ports technical note](https://www.vertiv.com/globalassets/products/monitoring-control-and-management/software/avocent-dsview-management-software/vertiv-avocent-dsview-4.5-tcp_udp-ports-tech-note.pdf) (vertiv.com)
- iana — [IANA port registry — 3871 (avocent-adsap)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3871) (iana.org)

---

HTML: <https://whatport.net/3871/> · JSON: <https://whatport.net/3871.json> · full dataset: <https://whatport.net/ports.json>