For CISCO1841-SEC/K9, how many ssl vpn and and ipsec vpn connection we can make? The datasheet doesn't says any specific number.
With the PIX and the ASA the number of peers is specified in the license and limited to the number specified in the license (so to support more peers you need to upgrade the license). In my experience the IOS implementation does not tie the number of peers to anything in the license. So if you purchase a feature set for your IOS router that supports IPSec/SSL VPN then that is your license for IPSec and SSL peering (no separate license is required).