TCP - AVD Test

This test tracks various statistics pertaining to TCP connections to and from the chosen Session Host / Azure Virtual desktop. The details of the test are provided below:

Target of the test : An Azure Virtual Desktop

Agent deploying the test : An internal agent.

Outputs of the test : One set of results for each type of TCP connection handled by the chosen Session Host / Azure Virtual Desktop

Configurable parameters for the test
Parameters Description

Test Period

How often should the test be executed.

Host

The host for which the test is to be configured.

Port

The default port is NULL.

Report Names

The detailed diagnosis of this test lists the top-10 hosts that have established the maximum number of TCP connections with the monitored virtual desktop. Set this flag to Yes if you want the detailed diagnosis to display the host name of these hosts  and not the IP address. To view the IP address of the hosts instead, set this flag to No.

Show Top

By default, the detailed diagnosis of this test displays only the top-10 hosts in terms of the number of TCP connections they have established with the monitored virtual desktop. If you want more or less number of hosts to be included in the detailed diagnostics, then change the value of the Show Top parameter accordingly. For instance, to have detailed diagnosis display the top-15 hosts, change the value of Show Top to 15.

DD Frequency

Refers to the frequency with which detailed diagnosis measures are to be generated for this test. The default is 0:1. This indicates that, by default, detailed measures will be generated only when the test detects a problem. You can modify this frequency, if you so desire. Also, if you intend to disable the detailed diagnosis capability for this test, you can do so by specifying none against DD Frequency.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.

 

Measurements made by the test
Measurement Description Measurement Unit Interpretation

In connection rate

Indicates the connections per second received by the virtual desktop.

Conns/Sec

A high value can indicate an increase in input load.

Out connection rate

Indicates the connections per second initiated by the virtual desktop.

Conns/Sec

A high value can indicate that the virtual desktop has started using a number of TCP connections to some other VM or host.

Current connections

Indicates the currently established connections.

Number

A sudden increase in the number of connections established on a virtual desktop can indicate either an increase in load to one or more of the applications executing on the desktop, or that one or more of the applications are experiencing a problem (e.g., a slow down). On Microsoft Windows, the current connections metrics is the total number of TCP connections that are currently in the ESTABLISHED or CLOSE_WAIT states.

Connection drops

Indicates the rate of established TCP connections dropped from the TCP listen queue.

Conns/Sec

This value should be 0 for most of the time. Any non-zero value implies that one or more applications on the desktop are under overload.

Connection failures

Indicates the rate of half open TCP connections dropped from the listen queue.

Conns/Sec

This value should be 0 for most of the time. A prolonged non-zero value can indicate either that the desktop is under SYN attack or that there is a problem with the network link to the desktop that is resulting in connections being dropped without completion.