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Port 35355 (altova-lm, altova-lm-disc)

IANA assigns port 35355 to altova-lm, altova-lm-disc: Altova License Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
altova-lm TCP Altova License Management Alexander Falk 2 -
altova-lm-disc UDP Altova License Management Discovery Alexander Falk 2 -

Registry dates for this port: registered 2011-07-07.

Check what is listening on port 35355

Linux: is anything listening on TCP 35355?
sudo ss -tlnp 'sport = :35355'
Linux: UDP 35355
sudo ss -ulnp 'sport = :35355'
Linux / macOS: which process owns the port
sudo lsof -nP -i :35355
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':35355 '
Windows (Command Prompt)
netstat -ano | findstr :35355
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 35355 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 35355
From Windows
Test-NetConnection HOST -Port 35355
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 35355

Block port 35355 in the firewall

ufw
sudo ufw deny 35355/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 35355 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 35355 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 35355' -Direction Inbound -Protocol TCP -LocalPort 35355 -Action Block
ufw
sudo ufw deny 35355/udp
iptables
sudo iptables -A INPUT -p udp --dport 35355 -j DROP
nftables
sudo nft add rule inet filter input udp dport 35355 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 35355' -Direction Inbound -Protocol UDP -LocalPort 35355 -Action Block

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