最近在搞LTE优化，但是在优化的过程中发现RSRP\SINR非常好仍旧出现FTP upload error，原因值为以下 1. FTP Upload End;FTP Upload IP Service Access Failure
Service Status: Failed. Session Identity: 477. Fixed Duration: 90.0 s.
Time basedmeasurement: True. ;Cause: First Packet and First Ack not received.
Session Identity: 477. Time based measurement: True.
2. FTP Upload Error;FTP Upload Data Transfer Cutoff
Cause: Access denied, Unable to read data from the transport connection:
由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。..
Session Identity: 75. Fixed Duration: 90.0 s. Time based measurement: True. ;
First Packet and First Ack received. Session Identity: 75. Time based
measurement: True.
3. FTP Upload Error;FTP Upload Service Not Accessible
Cause: FTP failure, 500 OOPS: vsf_sysutil_bind / listen. Session Identity: 39.
Fixed Duration: 90.0 s. Time based measurement: True. ;Cause: First Packet and
First Ack not received. Session Identity: 39. Time based measurement: True.
请各位大神不吝赐教