09-19-2005 04:48 AM - edited 03-09-2019 12:27 PM
This morning, I recently received this entry on my syslog daemon from my PIX. Can anyone please shed light as to what this means? Thanks.
...%PIX-4-500004: Invalid transport field for protocol=6, from 69.226.93.202/0 to (My WAN IP)/445
09-19-2005 06:40 AM
Looks like someone tryed to fingerprint (OS and open port detection) your PIX with a Port Scanner. Happend all the time !
See:http://www.sans.org/y2k/110300.htm
See section 4:
4) Nmap protocol scan on firewall IP address
A protocol type nmap scan -sO upon the firewall IP showed all protocols as being active (1-133) from the scanners point of view. The firewall dropped all of these packets. Partial logfile:
sincerely
Patrick
09-19-2005 06:52 AM
Cisco log and error message:
500004
Error Message %PIX-4-500004: Invalid transport field for protocol=protocol, from
source_address/source_port to dest_address/dest_port
Explanation This message appears when there is an invalid transport number, in which the source or destination port number for a protocol is zero. The protocol field is 6 for TCP and 17 for UDP.
Recommended Action If these messages persist, contact the peer's administrator.
See:
sincerely
Patrick
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