Diagnosis References - Application Layer
Colasoft Capsa offers expert diagnosis for the following application layer events.

EventDescriptionSeverityThresholdPossible causes and solutions
Domain Name is Inexistent The domain name referenced in the query does not exist.Information 
  • The requested domain doesn't exist.
  • User types in an invalid domain.
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    DNS Server Slow Response Time The average response time from the server is higher than the Slow Response Time threshold.Notice  The web server is overloaded.
    DNS Error The server response to the required host or domain is not implement. Notice  
  • Format error
  • Server failure
  • Refused
  • Not Implemented
  • Reserved
    		•
    HTTP Server Slow Response TimeThe average response time from the server is equal to or higher than the Slow Response Time threshold.NoticeSlow Response Time - 150 millisecondsThe web server is overloaded.
    HTTP Basic Authentication FailureThe failure of a HTTP client’s authentication request results in the immediate denial of authentication.Warning  Check for invalid login username or password.
    HTTP Non-HTTP TrafficA HTTP 80/TCP connection contains non-HTTP traffic.Warning  
  • An application running on TCP port 80 produces non-HTTP traffic.
  • Verify the traffic content of source station and destination station.
    		•
    HTTP Request Not FoundHTTP server returns this error when the requested URL was not found.Information 
  • User types in an invalid Uniform Resource Location (URL).
  • The connection to the web server is broken.
    		•
    HTTP Client ErrorHTTP server returns a 4xx error code other than 404 (Request Not Found) to indicate a client error.Information   
    HTTP Server ErrorHTTP server returns a 5xx error code to indicate a server error; the client’s request is usually valid.Warning   
    POP3 Logon FailureA POP3 client fails to log in to a server.Warning  Check for invalid login username or password.
    POP3 Server Slow Response TimeThe average response time from the server is equal to or higher than the Slow Response Time threshold.NoticeSlow Response Time - 150 millisecondsThe POP3 server is overloaded.
    POP3 Non-POP3 TrafficA POP3 110/TCP connection contains non-POP3 traffic.Warning 
  • An application running on TCP port 110 produces non-POP3 traffic.
  • Verify the traffic content of source station and destination station.
    		•
    POP3 Server Returned ErrorA POP3 connection or request is rejected by a POP3 server after a TCP connection has already been established.Critical 
  • The client issues an invalid command.
  • The server is busy.
    		•
    SMTP Logon FailureA SMTP client fails to log in to a server.Warning Check for invalid login username or password.
    SMTP Server Slow Response TimeThe average response time from the server is equal to or higher than the Slow Response Time threshold.NoticeSlow Response Time - 150 millisecondsThe SMTP server is overloaded.
    SMTP Non-SMTP TrafficA SMTP 25/TCP connection contains non-SMTP traffic.Warning 
  • An application running on TCP port 25 produces non-SMTP traffic.
  • Verify the traffic content of source station and destination station.
    		•
    SMTP Server Returned ErrorA SMTP connection or request is rejected by a SMTP server after a TCP connection has already been established.Critical 
  • The client issues an invalid command.
  • The server is busy.
    • FTP Logon FailureA FTP client fails to log in to a server.Warning Check for invalid login username or password.
    FTP Server Slow Response TimeThe average response time from the server is equal to or higher than the Slow Response Time threshold.NoticeSlow Response Time - 150 millisecondsThe SMTP server is overloaded.
    FTP Non-FTP TrafficA FTP control 21/TCP connection contains non-FTP control traffic.Warning 
  • An application running on TCP port 21 produces non- FTP control traffic.
  • Verify the traffic content of source station and destination station.
    • FTP Server Returned ErrorA FTP connection or request is rejected by a FTP server after a TCP connection has already been established.Critical 
  • The client issues an invalid command.
  • The server is busy.
    • FTP Data Connection FailureAn initiated FTP data connection fails to be created.Warning 
  • A firewall blocks the FTP data connection.
  • The FTP server does not accept PASV FTP data connections.
    • Telnet Logon FailureA Telnet client fails to log in to a server.Warning Check for invalid login username or password.
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