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Severity: Notice
Event Description Threshold Possible causes and solutions
TCP Reset
Inactive
Connection
An established TCP
connection has been reset
by one end of the
connection after the Reset
Inactive Connection
threshold is reached.
Reset Inactive
Connection - 15
seconds
∗ A TCP Server resets a client connection
if the client has been idle for too long.
∗ Many older Web browsers use Reset
Connection to shut down their HTTP
connections; however, newer browsers
are better at complying with the TCP
disconnection procedures. Due to the fact
that many older browsers are still in use,
TCP Reset Connection events are very
common in many of today's LANs.
Diagnoses
Network Analyzer
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TCP
Retransmission
The sender does not
receive an acknowledgment
(ACK) from the receiver,
and therefore retransmits
the packet.
∗ The acknowledgment packets are being
transmitted via a slower path.
∗ The network load is very high.
∗ The receiver or router is overloaded.
Severity: Warning
Event Description Threshold Possible causes and solutions
TCP Repeated
Connect Attempt
A client is attempting
multiple times to establish a
TCP connection.
A firewall may be blocking the SYN
packet sent from the client to the
server, or ACK packet sent from the
server to the client.
TCP Connection
Refused
A client’s initial TCP
connection attempt has
been rejected by the target
host.
∗ A client is requesting a service
that the host does not offer.
∗ There are no more available
resources on the server to accept
new connections.
TCP Too Many
Retransmissions
The percentage of
retransmissions on a
connection is equal to or
higher than the Too Many
Retransmissions threshold.
Too Many
Retransmissions –
10%
∗ The acknowledgment packets are
being transmitted via a slower path.
∗ The network load is very high.
∗ The receiver or router is
overloaded.
TCP Fast
Retransmission
A TCP sender retransmits a
packet before Fast
Retransmission threshold is
reached.
Fast Retransmission –
150 milliseconds
∗ The acknowledgment packets are
being transmitted via a slower path.
∗ The network load is very high.
∗ The receiver or router is
overloaded.
TCP Invalid Checksum
The checksum of a TCP
header and/or data is in
error. The checksum value
is calculated by the sender
and written to the packet,
and then recalculated from
the received packet by the
receiver. It indicates an
error if the two values are
different.
∗ There is a faulty device on the
network.
∗ If the checksum of all local
packets are showed as invalid, it
may be the checksum offload
feature has been enabled; in this
case, the adapter performs the
cycle-intensive process of
calculating CRC, the Windows
TCP/IP stack does not calculate the
IP and TCP checksums and leaves
them as 0x0000. Colasoft Capsa
collects the copy of each outgoing
packet before it goes to the adapter.
To fix this issue, you need to disable
the adapter's Offload Transmit IP
Checksum and Offload Transmit
TCP Checksum feature in the
advanced setting dialog.
TCP Zero Window Too
Long
The window size of one end
of a TCP connection being
zero is longer than the time
specified by the Zero
Window Time threshold.
Zero Window Time –
500 milliseconds
∗ The receiver is very busy.
∗ There are insufficient network
buffers in the receiving station.
∗ This is an indirect result of an
application program's behavior. For
example, the application may be
waiting for some other events
happening, or the application may
Diagnoses
Network Analyzer
© 2009 Colasoft. All rights reserved. Colasoft®, the Colasoft logo, Capsa® are among the trademarks or registered trademarks of the company in
the United States and/or other countries. All other trademarks are property of their respective owners. 77 / 77
not be releasing the frame buffer.
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