For ease of use, the TrueConf technical support team recommends adding the domain name of TrueConf Server to the list of external addresses. The domain name will correctly resolve to internal IP addresses within the corporate network and to external IP addresses when a user connects to the server from outside. This means that the customer’s network must be configured correctly which will allow users to enter a convenient domain name instead of an IP address when connecting to the server.<\/p>\n Sometimes, users may be unable to send files to private and group chats, and in such cases, you should also specify the domain name of TrueConf Server in the External addresses<\/strong> table. This problem may occur, even if you use TrueConf Server exclusively within a local network, for example, when ports are forwarded<\/a>. This issue occurs because file transfer involves filtering which is aimed at optimizing network traffic, and it is necessary to explicitly specify the destination address of the server to which the file should be delivered.<\/p>\n \nThe use of the fully qualified domain name (FQDN) instead of an IP address allows users to maintain access to the server both inside and outside the network. Additionally, if the network configuration is changed (for example, a different IP address is used), TrueConf Server will remain accessible to users.\n<\/p>\n<\/div>\n To make sure that the users of the video conferencing system can work with the the scheduler, real-time meeting management, slide sharing, and have access to the personal area, you need to specify the server domain name (FQDN) accessible to all users<\/b> in the Web \u2192 Settings<\/strong> section<\/a>:<\/p>\n In the field External address of TrueConf Server web<\/strong>, enter the full domain name in this format One of the requirements<\/a> for the correct work of federation is that federated servers must be accessible to each other by their DNS (FQDN) name specified during registration. So, you need to make sure that the correct domain name is entered in the section Summary \u2192 License info \u2192 Register<\/strong><\/a>:<\/p>\n Make sure that client connections have access to the server through the main port 4307 TCP<\/b>. This port is used for server connections, media streaming in conferences, and chat features (including file transfer). If the default 4307 port is used, there is no need to specify it in the application connection settings.<\/p>\n We recommend using the standard 4307 port; it should be changed only if there are specific port requirements set by the security department.<\/p>\n To check the availability of a server via the selected port, use the tnc<\/b> program for Windows and nc<\/b> for Linux.<\/p>\n To check the availability of the port, open Windows PowerShell<\/b> (Win+R \u2192 powershell) and execute the command:<\/p>\n Where:<\/p>\n Example:<\/p>\n If the entered port is available, you will see If the port you specified is unavailable, you will see Open the terminal and run this command:<\/p>\n Where: <\/p>\n Example:<\/p>\n If the entered port is available, you will see If the specified port is unavailable, you will see As a rule, this port may be unavailable on the user\u2019s network due to the following reasons:<\/p>\n The standard 4307<\/b> port can be changed by going to the section Network \u2192 Network settings<\/strong>. In the Internal addresses<\/strong> block, click Add<\/strong> to open this window:<\/p>\n Specify the full domain name and port.<\/p>\n After specifying a custom port number, you need to enter the server address in the format ![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-19_163801-1024x347.png\" "\\"\\"")
<\/a><\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-19_164026-1024x464.png\" "\\"\\"")
<\/a><\/p>\nhttps:\/\/domain_name.com<\/code> and click Apply<\/strong>.<\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-19_164227-1024x463.png\" "\\"\\"")
<\/a><\/p>\nAvailability of ports for client connections<\/h2>\n
Windows<\/h3>\n
tnc server_address -port port_number<\/pre>\n
\n
server_address<\/code> \u2013 your TrueConf Server address<\/li>\nport_number<\/code> \u2013 the port that should be checked, in our case it is 4307<\/code><\/li>\n<\/ul>\ntnc video.example.com -port 4307<\/pre>\n
TcpTestSucceeded : True<\/code>:<\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-07_114411.png\" "\\"\\"")
<\/a><\/p>\nTcpTestSucceeded : False<\/code>:<\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-07_114421.png\" "\\"\\"")
<\/a><\/p>\nLinux<\/h3>\n
nc -vz server_address port_number<\/pre>\n
\n
server_address<\/code> \u2013 your TrueConf Server address<\/li>\nport_number<\/code> \u2013 port that should be checked, in our case it is 4307<\/code><\/li>\n<\/ul>\nnc -vz video.example.com 4307<\/pre>\n
Ncat: Connected to address:port<\/code>:<\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/clipboard_2025.05.07_12-30-58-690x464.png\" "\\"\\"")
<\/a><\/p>\nNcat: TIMEOUT<\/code>:<\/p>\n![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/clipboard_2025.05.07_12-37-33-690x405.png\" "\\"\\"")
<\/a><\/p>\nWhy is the port unavailable?<\/h2>\n
\n
How to change the default port<\/h3>\n
![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-19_164431-517x470.png\" "\\"\\"")
<\/a><\/p>\naddress:port<\/code>, in our example: video.example.com:4315<\/code> when connecting to the server from a client application.<\/p>\n
![\"\"](\"https:\/\/trueconf.com\/blog\/wp-content\/uploads\/2025\/05\/2025-05-19_164648-530x470.png\" "\\"\\"")
<\/a><\/p>\n