Port 903VMware Remote Console
VMware Remote Console (VMRC) enables users to remotely access and manage virtual machines hosted on VMware infrastructure, providing full console access with mouse and keyboard control for administration and troubleshooting purposes..
- transport
- tcp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 6,328
single transport
payload readable on path
used by convention
caution
rank 798 of 993 · top 80%
Technical Details
what runs on :903VMware Remote Console (VMRC) functions as a standalone application or browser plugin allowing direct console access to virtual machines (VMs) managed by VMware products like vSphere, ESXi, or vCenter Server. Utilizing port 903 by default over TCP, VMRC facilitates the transmission of display, input, and control commands between the client and the virtual machine’s console, enabling seamless interaction as if physically present at the VM.
The port supports the VMware Console protocol within the broader VMware VNC service to establish sessions, handle authentication, and maintain state consistency during virtual machine management scenarios. Unlike remote protocol alternatives such as RDP or SSH, VMRC provides direct hypervisor-level access, often required for tasks like OS installation, BIOS configuration, or recovery when higher-level network services are unavailable within the VM.
In VMware environments, communication over port 903 is generally initiated from the VMRC client, connecting directly to the ESXi host or via vCenter Server. Network considerations should include firewall rules accommodating this port to ensure connectivity, while also considering segmentation to limit exposure.
Security Information
exposure of :903risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
remote access averages 4.0 across 110 ports — this one sits level with it.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
unofficial
used by convention, not registered — what answers here varies by deployment
reachable over
tcp
every listening transport is another surface to filter at the edge
security overview
Common vulnerabilities:
- Unauthorized access due to improper authentication controls or weak credentials
- Man-in-the-middle (MitM) attacks if traffic is unencrypted
- Port exposure in public networks increasing brute force risks
- Exploitation of outdated VMware services to gain unauthorized console access
Common mitigations:
- Enforce strong multi-factor authentication for console access
- Restrict port 903 exposure to trusted IP ranges only via firewalls
- Enable encryption/tunnel the VMRC communication via secure channels (e.g., VPN, SSH port forwarding)
- Keep VMware infrastructure components patched to the latest security updates
- Monitor console access logs for unusual activity and configure alerts on anomalous use
Related Ports
the 8 most looked-up other ports in remote access — 110 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :8000 | Intel Remote Desktop / Alternate HTTP Port | TCP | Web Services | safe | 84.3k |
| :8888 | D2GS Admin Console | TCP | Remote Access | caution | 83.7k |
| :8881 | Atlasz Secure Server | TCP | Web Services | caution | 67.6k |
| :5938 | TeamViewer | TCPUDP | Remote Access | caution | 65.0k |
| :8291 | Winbox MikroTik Admin | TCP | Security | caution | 62.9k |
| :8008 | IBM HTTP Server Admin | TCP | Web Services | caution | 58.3k |
| :135 | Microsoft EPMAP | TCPUDP | Security | caution | 51.9k |
| :23 | Telnet | TCP | Remote Access | caution | 34.8k |
risk mix of the 8 listed
- safe13%
- caution88%
0 of 8 encrypted