Port 13785 NBDB
Port 13785 is the IANA-assigned nbdb port for NetBackup Database (TCP / UDP).
What is port 13785 used for?
Port 13785 is assigned to nbdb and uses TCP / UDP. The IANA registry describes the service as “NetBackup Database”. It sits above the registered range, where most numbers are transient client ports. A fixed high port is worth documenting precisely because tooling often assumes the default.
Ports are the transport-layer address a service listens on. A client that wants to reach nbdb connects to port 13785. A TCP connection is refused when nothing is listening, while a UDP request simply goes unanswered. That is why a port conflict appears whenever two processes try to bind the same number.
Use the commands below to confirm whether port 13785 is actually in use before you change firewall rules. Blocking the port stops new inbound traffic at the firewall, but it does not stop a local process from listening, and it does not remove the service from the machine.
Source: IANA Service Name and Transport Protocol Port Number Registry. Registered assignee: [Pat_Tovo].
Check and block port 13785
Copy-ready commands for the protocols assigned to this port. Run the check first, then block only what should not be reachable.
Check on Linux
sudo ss -tlpn 'sport = :13785'
sudo ss -ulpn 'sport = :13785'Check on Windows
Get-NetTCPConnection -LocalPort 13785 -State Listen -ErrorAction SilentlyContinue
Get-NetUDPEndpoint -LocalPort 13785 -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 13785/tcp
sudo ufw deny 13785/udpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 13785 -j DROP
sudo iptables -A INPUT -p udp --dport 13785 -j DROPThese commands are examples for a typical host. Check the listener before you change firewall rules, and persist iptables rules with iptables-save or netfilter-persistent. On Windows, use Windows Defender Firewall or New-NetFirewallRule for persistent blocks. The iptables rules here cover IPv4; mirror them with ip6tables if IPv6 is enabled.
Is port 13785 safe to expose?
This port is not on our curated list of services with a widely exploited profile. Exposure is only safe when the listening service is intended, patched and protected by a firewall. Keep the listening service patched and remove it if unused. A default-deny firewall policy with explicit allow rules is still the safest baseline.
Where port 13785 is usually used
Most traffic on port 13785 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.
- Application servers opening pooled connections to the database on port 13785.
- Migrations, backups and reporting jobs run from a trusted bastion host.
- Local Docker or test environments that publish the database on the host.
Open a test connection
Probe the TCP listener before you debug credentials or driver settings.
nc -vz 127.0.0.1 13785Common problems with port 13785
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 13785. A timeout more often means a firewall drop, a wrong host or a service bound to a different interface.
Port already in use
Find the process holding the port with sudo ss -tlpn 'sport = :13785' or sudo lsof -i :13785. Stop that process or configure it to bind another port; killing it without identifying it can take down a production service.
Firewall rule did not survive a reboot
UFW and Windows Firewall keep rules across restarts. Raw iptables rules do not: save them with iptables-save or the netfilter-persistent package, and re-apply after upgrades that reset the ruleset.
The port is blocked but still reachable
A firewall rule filters inbound traffic; it does not close the listener. Confirm with the check command above and bind the service to 127.0.0.1 when only local clients need it.
Port 13785 at a glance
| Port number | 13785 |
|---|---|
| Service name | nbdb |
| Transport protocol | TCP / UDP |
| Category | Databases |
| Range | High port (10001–65535) |
| Risk level | Standard/Low |
| Registered assignee | [Pat_Tovo] |
| Registry description | NetBackup Database |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 13785 used for?
Port 13785 (NBDB) uses TCP / UDP. NetBackup Database.
How do I check if port 13785 is open?
On Linux run `sudo ss -tlpn 'sport = :13785'` and `sudo ss -ulpn 'sport = :13785'`. On Windows run `Get-NetTCPConnection -LocalPort 13785 -State Listen -ErrorAction SilentlyContinue` and `Get-NetUDPEndpoint -LocalPort 13785 -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 13785; empty output usually means nothing is bound to it.
How do I block port 13785?
With UFW run `sudo ufw deny 13785/tcp` and `sudo ufw deny 13785/udp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 13785 -j DROP` and `sudo iptables -A INPUT -p udp --dport 13785 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.
Is port 13785 safe to expose?
This port is not on our curated list of services with a widely exploited profile. Exposure is only safe when the listening service is intended, patched and protected by a firewall. Nevertheless, keep the listening service patched and remove it if unused. A default-deny firewall policy with explicit allow rules is still the safest baseline.
Related ports
Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy