Error registering plugin with vault 1.21.1

[milijan]

Reproduce:

vault plugin register -sha256=414f5fca39ae7666844e1fddaf30b346d14c8c29b97f184587bf63acad7de367 secret op-connect

Expected result:

plugin listed in output of vault plugin list secret

Actual result:

command returns

Error registering plugin op-connect: Error making API request.

URL: PUT https://vault/v1/sys/plugins/catalog/secret/op-connect
Code: 500. Errors:

* 1 error occurred:
	* failed to persist plugin entry: context canceled`

Vault server logs
:plugin acceptAndServe error: broker closed

Addional Information:

Vault Status

Key                     Value
---                     -----
Seal Type               shamir
Initialized             true
Sealed                  false
Total Shares            5
Threshold               3
Version                 1.21.1
Build Date              2025-11-18T13:04:32Z
Storage Type            raft

Docker environment

Client:
 Version:           28.5.1
 API version:       1.51
 Go version:        go1.24.8
 Git commit:        e180ab8
 Built:             Wed Oct  8 12:16:12 2025
 OS/Arch:           linux/arm64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          28.5.1
  API version:      1.51 (minimum version 1.24)
  Go version:       go1.24.8
  Git commit:       f8215cc
  Built:            Wed Oct  8 12:17:27 2025
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          v1.7.28
  GitCommit:        b98a3aace656320842a23f4a392a33f46af97866
 runc:
  Version:          1.3.0
  GitCommit:        v1.3.0-0-g4ca628d
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0