UMTS/HSPA Module Series

WCDMA UGxx FTP AT Commands Manual

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5. The module only supports three PDP contexts activated simultaneously, so you must make sure the

number of activated PDP contexts is less than 3.

If the result of checking is OK, but the result of executing AT+QIACT command still fails, please reboot the

module to resolve this issue. After rebooting the module, please follow the above checking at least three

times and each time at an interval of 10 minutes to avoid frequently rebooting of the module.

1.4.3. DNS Parse Fails

When executing AT+QFTPOPEN command, if “+QFTPOPEN: 604,0” is returned, please check the

following aspects:

1. Make sure the domain name of FTP server is valid.

2. Query the status of PDP context by executing “AT+QIACT?” command to make sure the specified

PDP context has been activated successfully.

1.4.4. Error Response of FTP Server

If the <protocol_error> in “+QFTPXX: <err>,<protocol_error>” is not 0, it is replied from FTP server. You

can check the issues depending on the protocol error code. For example, if <protocol_error> is 533 (Not

login, refer to Chapter 5), <username> or <password> may be wrong. If <protocol_error> is 550 (Request

failed, refer to Chapter 5), the file or directory may not exist. For details, you can refer to the document

RFC959 (File Transfer Protocol).

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