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AT command problem in TCP @GSM Module

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hi,everyone I try to establish a TCP connection in GSM module with ATcommand. and I sent AT-command in below,Please help me
(in line that have // means i send to GSM)
(if no// means that's response from GSM module)
****************************************************
NORMAL POWER DOWN
 RDY

+CFUN: 1

+CPIN: READY

Call Ready
at+cipflp=0 //1

OK
at+cipstart="tcp","(IP address of server)","(Port)" //2

OK

CONNECT FAIL

STATE: IP IND

+PDP: DEACT
at+cipshut // 3

STATE: PDP DEACT

SHUT OK
at+cipstart="tcp","(IP addressOf server)","(Port)" //4

OK

CONNECT FAIL

STATE: IP IND

+PDP: DEACT
************************************************

In above,at //3 I sent cipshut because "+PDP: DEACT"(i did follow datasheet). But can't Conect OK.

Has GSM module more Setting?

Please help me.
Thank you

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