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Port 2521 (adaptecmgr)

IANA assigns port 2521 to adaptecmgr: Adaptec Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
adaptecmgr TCP Adaptec Manager Mark Parenti -
adaptecmgr UDP Adaptec Manager Mark Parenti -

Check what is listening on port 2521

Linux: is anything listening on TCP 2521?
sudo ss -tlnp 'sport = :2521'
Linux: UDP 2521
sudo ss -ulnp 'sport = :2521'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2521
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2521 '
Windows (Command Prompt)
netstat -ano | findstr :2521
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2521 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2521
From Windows
Test-NetConnection HOST -Port 2521
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2521

Block port 2521 in the firewall

ufw
sudo ufw deny 2521/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2521 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2521 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2521' -Direction Inbound -Protocol TCP -LocalPort 2521 -Action Block
ufw
sudo ufw deny 2521/udp
iptables
sudo iptables -A INPUT -p udp --dport 2521 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2521 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2521' -Direction Inbound -Protocol UDP -LocalPort 2521 -Action Block

Related ports

2519globmsgsvc2520pvsw2522windb2523qke-llc-v3

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.