Ja bih razlog tražio u hardweru(CPU+RAM)... sa pptp radi a sa ipsec neće?
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VPN - Heavy use of any of the VPN services included in the pfSense software will increase CPU requirements. Encrypting and decrypting traffic is CPU intensive. The number of connections is much less of a concern than the throughput required. A 266 MHz CPU will max out at around 4 Mbps of IPsec throughput, a 500 MHz CPU can push 10-15 Mbps of IPsec, and relatively new server hardware (Xeon 800 FSB and newer) deployments are pushing over 100 Mbps with plenty of capacity to spare. Supported encryption cards, such as several from Hifn, are capable of significantly reducing CPU requirements.
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Large State Tables - State table entries require about 1 KB of RAM each. The default state table, when full at 10,000 entries, takes up a little less than 10 MB RAM. For large environments requiring state tables with hundreds of thousands of connections, ensure adequate RAM is available.
RB750GL ima takt CPU-a na 400Mhz što je relativno slab procesor... doduše ima 64MB RAM... možda i grešim. Imaš li i neki Hotspot ili QoS? Sve to moraš da uzmeš u obzir...