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Port 3703 (adobeserver-3)

IANA assigns port 3703 to adobeserver-3: Adobe Server 3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
adobeserver-3 TCP Adobe Server 3 - -
adobeserver-3 UDP Adobe Server 3 - -

Check what is listening on port 3703

Linux: is anything listening on TCP 3703?
sudo ss -tlnp 'sport = :3703'
Linux: UDP 3703
sudo ss -ulnp 'sport = :3703'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3703
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3703 '
Windows (Command Prompt)
netstat -ano | findstr :3703
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3703 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3703
From Windows
Test-NetConnection HOST -Port 3703
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3703

Block port 3703 in the firewall

ufw
sudo ufw deny 3703/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3703 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3703 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3703' -Direction Inbound -Protocol TCP -LocalPort 3703 -Action Block
ufw
sudo ufw deny 3703/udp
iptables
sudo iptables -A INPUT -p udp --dport 3703 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3703 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3703' -Direction Inbound -Protocol UDP -LocalPort 3703 -Action Block

Related ports

3701netcelera3702WS-Discovery3704adobeserver-43705adobeserver-5

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