Router 2600 VPN problem


We are using Router 2600 as our gateway Router for Leased Line

External : Public Ip *.*.*.229

Internal IP : Private Ip

NAT: *.*.*.227 - *.*.*.228

We use RSA-SIG "SEC-ID" to connect our site at US But suddenly without any changes doen on router

It stops working but when i use Dal up from other ISP it works good.

What can be the reason or i have to do any changes for this VPN?

Is tehre some ports issue or Natting?

Thanks in advance Chetan

*All says i am wrong but blood says itself B+"
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