HTTPfy

Port 3656 (abatjss)

IANA assigns port 3656 to abatjss: ActiveBatch Job Scheduler.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
abatjss TCP ActiveBatch Job Scheduler Ben Rosenberg -
abatjss UDP ActiveBatch Job Scheduler Ben Rosenberg -

Registry dates for this port: registered 2003-01.

Check what is listening on port 3656

Linux: is anything listening on TCP 3656?
sudo ss -tlnp 'sport = :3656'
Linux: UDP 3656
sudo ss -ulnp 'sport = :3656'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3656
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3656 '
Windows (Command Prompt)
netstat -ano | findstr :3656
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3656 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3656
From Windows
Test-NetConnection HOST -Port 3656
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3656

Block port 3656 in the firewall

ufw
sudo ufw deny 3656/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3656 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3656 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3656' -Direction Inbound -Protocol TCP -LocalPort 3656 -Action Block
ufw
sudo ufw deny 3656/udp
iptables
sudo iptables -A INPUT -p udp --dport 3656 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3656 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3656' -Direction Inbound -Protocol UDP -LocalPort 3656 -Action Block

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