It's a memory limitation, not a license limitation. In a 515 it's a decent amount. How many do you have? What does show memory look like?
thanks for the reply.
Free memory: 57864384 bytes (43%)
Used memory: 76353344 bytes (57%)
Total memory: 134217728 bytes (100%)
Cisco PIX Security Appliance Software Version 8.0(4)32
Hardware: PIX-515E, 128 MB RAM, CPU Pentium II 433 MHz
Flash E28F128J3 @ 0xfff00000, 16MB
BIOS Flash AM29F400B @ 0xfffd8000, 32KB
how many can it have?
There is no hard number and going by free memory it's still a best guess. You're using just over half your memory so I would say 500 more or so. ESTIMATED GUESS though.
right now i have 89 static NATs and PAT on the outside interface.
89 in use, 89 most used
658 in use, 2048 most used
could the conn fill the NAT table?
Not necessarily. You can have multiple TCP streams in a single NAT translation. Those streams would be from the same client to the same server. For example, if a client connects to your webserver, it will create a TCP connection for the web page. It may also create another TCP connection for an image on the web page.