# TCP

Device > Monitor > TCP

The TCP dialog box displays the following data:

- Active Opens (tcpActiveOpens)
- Passive Opens (tcpPassiveOpens)
- Attempt Fails (tcpAttemptFails)
- Estab Resets (tcpEstabResets)
- Currr Estab (tcpCurrEstab)
- Out Rsts (tcpOutRsts)

The following list specifies buttons in this dialog box, as well as their function:

- To specify the refresh rate for this dialog box, select a value from the drop-down box.
- Click Start/Stop to begin/end device monitoring.

  Note: The Start/Stop toggle feature is supported by CiscoView 5.3 and later.

- Click Cancel to close the dialog box.
- Click Print to print the contents of the dialog box.
- Click Help to access online help.

Active Opens (tcpActiveOpens)

Number of times TCP connections have made a direct transition to the "SYN-SENT" state from the "CLOSED" state.

Passive Opens (tcpPassiveOpens)

Number of times TCP connections have made a direct transition to the "SYN-RCVD" state from the "LISTEN" state.

Attempt Fails (tcpAttemptFails)

Number of times TCP connections have made a direct transition to the "CLOSED" state from either the "SYN-SENT" or "SYN-RCVD" state, plus the number of times TCP connections have made a direct transition to the "LISTEN" state from the "SYN-RCVD" state.

Estab Resets (tcpEstabResets)

Number of times TCP connections have made a direct transition to the "CLOSED" state from either the "ESTABLISHED" or "CLOSE-WAIT" state.

Currr Estab (tcpCurrEstab)

Number of TCP connections currently in the "ESTABLISHED" or "CLOSE-WAIT" state.

Out Rsts (tcpOutRsts)

Number of TCP segments sent which contain the RST flag.