TCP Port 81 Information

Port name:HOSTS2 Name Server
Port 81 common errors:The error message "An unknown filter was not added: PHP" is common to this port. This means the user is experiencing problems with the server even after installing ISPConfig To learn more about errors in your system run a free registry scan.
Services or applications using this port:World Wide Web
Malicious services / applications:Bagle.BC

Port 81 details:

Protocol: TCP
IAMA status: Unofficial
Range: Well-known
Traffic: inbound
Notification: True
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Technical description for port 81:

Port 81 is of significant value to the system because of its capabilities of Web port adjacency to the HyperText Transfer Protocol (HTTP). In case this primary operation fails, Port 81 can serve as the most fitting alternative to the default port with respect to all affecting factors such as relevance in appearance and proximity.
Port 81 is an agent for defining communication format between the user and the internet. This port is also among the system entities capable of enabling the transmission of files between systems. It is considered an indispensable facility within the system due to its perfectly alternating value.
This port works when the URL is shown within the page, specifically when the HTTP or WWW letters is registered onscreen. Port 81 is also responsible for connecting the system to the target facility by first determining the appropriate prefix for the address or page.
Port 81 is a custom part of the system within the computing device_s connectivity facility. If this port was intended to be set to alternate the default port, the client would first need to override the default port with the values of that of the target port.
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