Port 5022Microsoft SQL Server Database Mirroring

TCP 5022 commonly carries SQL Server database mirroring and Always On availability-group traffic.

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

also known as mice, SQL Server Database Mirroring, Always On availability-group endpoint

Technical Details

what runs on :5022

SQL Server database mirroring and Always On availability-group endpoints commonly listen on TCP 5022. They use SQL Server's database-mirroring endpoint protocol, not the ordinary client-facing TDS connection protocol; SQL Server instances authenticate and exchange replica and database state over the endpoint. The port is a convention rather than a requirement and can be changed. This widely encountered use differs from IANA's “mice server” assignment; SQL Server does not use UDP 5022 for this endpoint.

Security Information

exposure of :5022

risk score

5/ 10caution

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

databases averages 3.7 across 145 ports — this one sits 1.3 above.

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 · udp

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

security overview

This endpoint is for communication between SQL Server instances, not general client access. It should normally be limited by firewall rules to the participating replicas and should not be exposed to the public internet. SQL Server endpoint configuration supports authentication and encryption, with encryption required by default for database-mirroring endpoints; verify the actual endpoint settings and authorized peers.

Record

iana registry entry

port: :5022
service: Microsoft SQL Server Database Mirroring
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 5/10caution
category: Databases
usage: Although IANA assigns 5022 to a “mice server,” engineers commonly encounter it as the default TCP port for Microsoft SQL Server database mirroring and Always On availability-group endpoints. The endpoint connects SQL Server instances for replica communication; its port is configurable.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 5022

Something wrong?

This record is maintained by the engineers who use port 5022. 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 2026-10-06.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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all 145 in databases →

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risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :5022Microsoft SQL Server Database Mirroring

Technical Details

Security Information

Related Ports

Port 5022Microsoft SQL Server Database Mirroring