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can't access boa provided web service or ftp or telnet server but PC ping ipnc36x and ipnc36x ping PC both are ok

Hi, everyone,

      I encountered a strange problem. The same kernel and cramfs image,  but a few ip camera have following problem, most are ok.

     PC ping ipnc36x and ipnc36x ping PC both are ok. But I can't access any network service such as web, ftp, telnet in my IPNC36X from PC. All the related process are alive in ps command, All the related tcpip port are in listen status in netstat -an command. When I use a tcpip port tool scan ipnc36x's all port, It can't find any accessiable port. In ipnc36x console, I telnet 127.0.0.1 80, boa web server program response http error info, then close socket autoly,  telnet 127.0.0.1 21,  get a connection refused message.

     who can give ideas for debug this bug? I don't known how to analysis or debug this.