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Port 7781 (accu-lmgr)

IANA assigns port 7781 to accu-lmgr.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
accu-lmgr TCP accu-lmgr Moises E Hernandez -
accu-lmgr UDP accu-lmgr Moises E Hernandez -

Check what is listening on port 7781

Linux: is anything listening on TCP 7781?
sudo ss -tlnp 'sport = :7781'
Linux: UDP 7781
sudo ss -ulnp 'sport = :7781'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7781
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7781 '
Windows (Command Prompt)
netstat -ano | findstr :7781
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7781 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7781
From Windows
Test-NetConnection HOST -Port 7781
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7781

Block port 7781 in the firewall

ufw
sudo ufw deny 7781/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7781 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7781 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7781' -Direction Inbound -Protocol TCP -LocalPort 7781 -Action Block
ufw
sudo ufw deny 7781/udp
iptables
sudo iptables -A INPUT -p udp --dport 7781 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7781 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7781' -Direction Inbound -Protocol UDP -LocalPort 7781 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.