Oct 13, 2013 · Nmap -sT -O returned "5900/tcp open vnc. Never saw this before. I googled it and found it may mean someone remotely viewing my box. Running SL6 with small KVM based virtual network. "/sbin/service vnc status" returns "unrecognized service", "/etc/init.d/vnc" returns "no such file or directory" "rpm -q vnc" returns "package vnc not installed".
To use this functionality, allow access to Virtual Network Computing VNC port TCP 5900 and IPMI port TCP 623 (with port 443 for https through web browsers) for LOM IP address on the firewall. If these ports are not allowed, then console access through LOM will fail. Jan 17, 2008 · * I've tried connecting to port 5900, 5901, and 3283 * I've tried enabling port mapping on the Airport (which seems crazy, since this is all happening within the LAN) I can SSH to the mini just fine from the Macbook. Using NetUtility, I can ping it, traceroute to it, you name it. TCP 443 TCP 623 TCP 5900: CTX200367: NSIP SNIP: DNS servers: Ping UDP 53 TCP 53: Ping is used for monitoring. Can be turned off by load balancing on the same appliance. 21/tcp - In general you should not have this port open. You should switch to a secure FTP. If you must keep it open at least limit access to only those IP addresses that update content. 23/tcp - Telnet should no longer be used. Switch to SSH. 25/tcp - This means an email service could be running on this server.
*Jun 5 10:21:15.320: %SEC-6-IPACCESSLOGP: list OUTBOUND-Theatre denied tcp 10.42.56.53(5900) -> 10.15.56.100(54229), 1 packet Everything else seems to be working as far as Internet Access, DHCP, and DNS.
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This section describes the TCP/IP raw socket protocol for communicating with the DDS 5900 Discussion System. This protocol provides a short set of commands, enabling a third-party control application to monitor and/or control system status of a DDS 5900 Discussion System.
Port 5900 VNC TCP Blocked: Inbound Most commonly used with Apple remote desktop. Incoming connections are only permitted through approved entry points such as the campus VPN. Port 3389 TCP and UDP Microsoft Remote Desktop Protocol Blocked: Inbound. This is a list of TCP and UDP port numbers used by protocols of the Internet protocol suite for operation of network applications.. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic. Add the protocol (TCP or UDP) and the port number into the next window and click Next. Select Allow the connection in the next window and hit Next. Select the network type as you see fit and click