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threshold.
SMTP Server Slow
Response Time
The average response time from
the server is equal to or higher
than the Slow Response Time
threshold.
Slow Response
Time - 150
milliseconds
The SMTP server is overloaded.
FTP Server Slow
Response Time
The average response time from
the server is equal to or higher
than the Slow Response Time
threshold.
Slow Response
Time - 150
milliseconds
The SMTP server is overloaded.
Severity: Warning
Event Description Possible causes and solutions
HTTP Basic Authentication
Failure
The failure of a HTTP client’s
authentication request results in the
immediate denial of authentication.
Check for invalid login username or password.
HTTP Non-HTTP Traffic
A HTTP 80/TCP connection contains
non-HTTP traffic.
∗ An application running on TCP port 80
produces non-HTTP traffic.
∗ Verify the traffic content of source station and
destination station.
HTTP Server Error
HTTP server returns a 5xx error
code to indicate a server error; the
client’s request is usually valid.
POP3 Logon Failure A POP3 client fails to log in to a
server. Check for invalid login username or password.
POP3 Non-POP3 Traffic
A POP3 110/TCP connection
contains non-POP3 traffic.
∗ An application running on TCP port 110
produces non-POP3 traffic.
∗ Verify the traffic content of source station and
destination station.
SMTP Logon Failure A SMTP client fails to log in to a
server. Check for invalid login username or password.
SMTP Non-SMTP Traffic
A SMTP 25/TCP connection
contains non-SMTP traffic.
∗ An application running on TCP port 25
produces non-SMTP traffic.
∗ Verify the traffic content of source station and
destination station.
SMTP Logon Failure A SMTP client fails to log in to a
server. Check for invalid login username or password.
SMTP Non-SMTP Traffic
A SMTP 25/TCP connection
contains non-SMTP traffic.
∗ An application running on TCP port 25
produces non-SMTP traffic.
∗ Verify the traffic content of source station and
destination station.
FTP Logon Failure A FTP client fails to log in to a
server. Check for invalid login username or password.
FTP Non-FTP Traffic
A FTP control 21/TCP connection
contains non-FTP control traffic.
∗ An application running on TCP port 21
produces non- FTP control traffic.
∗ Verify the traffic content of source station and
destination station.
FTP Data Connection
Failure
An initiated FTP data connection
fails to be created.
∗ A firewall blocks the FTP data connection.
∗ The FTP server does not accept PASV FTP
data connections.
Telnet Logon Failure A Telnet client fails to log in to a
server. Check for invalid login username or password.
Diagnoses
Network Analyzer
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Severity: Information
Event Description Possible causes and solutions
HTTP Request Not
Found
HTTP server returns this error when
the requested URL was not found.
∗ User types in an invalid Uniform Resource
Location (URL).
∗ The connection to the web server is
broken.
HTTP Client Error
HTTP server returns a 4xx error code
other than 404 (Request Not Found)
to indicate a client error.
Severity: Critical
Event Description Possible causes and solutions
POP3 Server Returned
Error
A POP3 connection or request is
rejected by a POP3 server after a TCP
connection has already been
established.
∗ The client issues an invalid command.
∗ The server is busy.
SMTP Server Returned
Error
A SMTP connection or request is
rejected by a SMTP server after a TCP
connection has already been
established.
∗ The client issues an invalid command.
∗ The server is busy.
FTP Server Returned
Error
A FTP connection or request is rejected
by a FTP server after a TCP connection
has already been established. ∗ The client issues an invalid command.
∗ The server is busy.
Diagnosis references - transport layer
Colasoft Capsa offers expert diagnosis for the following transport layer events.
　
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