We imposed a PIX (actually FWSM) between an LPR host and a Linksys WPS11 LPD print server. TCP connections (incudline LPR/LPD, WEB management, and Telnet management) to the Linksys no longer succeed across the firewall.
A trace of the connection attempt show a SYN/PUSH/ACK from the Linksys rather than a SYN/ACK in response to the SYN request.
We suspect the FWSM is rejecting this because of invalid FLAG bits in the TCP header, but nothing is logged at informational logging level.
Am I correct that the PUSH bit is causing the failure to connect?
Is there a way to turn off FLAG bit validation in the FWSM at least temporarily?
Is there a Linksys fix for this?