Port 7001 WebLogic / Cassandra SSL · TCP

What runs on port 7001

Oracle WebLogic Server's default listen port (and Cassandra's TLS inter-node port). WebLogic on 7001 has a long history of critical deserialization vulnerabilities exploited straight from the internet; the admin console must never be exposed.

Software that uses it: Oracle WebLogic · Apache Cassandra (SSL storage port)

Should port 7001 be open?

Private network or VPN only. Nothing good comes from this port being reachable from the internet. Keep it on an internal network, reach it over a VPN or an SSH tunnel, and firewall it from everything that does not need it.

• Front WebLogic with a reverse proxy on 443 and keep /console off the internet entirely.

Check port 7001

# on the host: is anything listening, and which process?
ss -ltnp 'sport = :7001'
sudo lsof -i :7001

# from another machine: is it reachable?
nc -zv host 7001
nmap -p 7001 host
curl -v telnet://host:7001      # raw TCP connect test, Ctrl-C to leave

A port that answers from the internet when it should not is the finding; nmap from a machine outside your network (or a VPS) is the honest test, because scans from inside the LAN pass the firewall you are trying to verify.

Allow or block port 7001

# ufw (Ubuntu/Debian)
sudo ufw allow from 10.0.0.0/8 to any port 7001 proto tcp
sudo ufw deny 7001/tcp

# nftables
nft add rule inet filter input ip saddr 10.0.0.0/8 tcp dport 7001 accept
nft add rule inet filter input tcp dport 7001 drop

# iptables (legacy)
iptables -A INPUT -p tcp --dport 7001 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 7001 -j DROP

# firewalld
sudo firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address=10.0.0.0/8 port port=7001 protocol=tcp accept'

Replace 10.0.0.0/8 with the networks that need access. Allowing by source address is the rule that matters; "allow 7001" with no source is just "open".

Putting it behind nginx

server {
    listen 443 ssl;
    server_name app.example.com;
    location / {
        proxy_pass http://127.0.0.1:7001;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
    }
}

Then make the application listen on 127.0.0.1:7001 only. Test which location block a request hits with the nginx location tester.

Related ports

• 7000 Cassandra — Inter-node
• 8080 HTTP alt — Tomcat, proxies, dev servers
• 8443 HTTPS alt — Tomcat, Plesk, Unifi

Part of the port number reference. Ports are 16-bit numbers; see also the subnet calculator and the packet decoder, which shows ports inside TCP and UDP headers.

Questions