networker备份失败，提示 Unable to set up the direct save with server，然后就不停的retry这一步，大家知道哪的问题吗

181407:save: Step (1 of 7) for PID-122428: Save has been started on the client 'localhost'.
174412:save: Step (2 of 7) for PID-122428: Running the backup on the client 'localhost' for the save set '/var/lib/mysql'.
180569:save: Identified a save for the backup with PID-122428 on the client 'localhost'. Updating the total number of steps from 7 to 6.
174920:save: Step (3 of 6) for PID-122428: Contacting the NetWorker server through the nsrd process to obtain a handle to the target media device through the nsrmmd process for the save set '/var/lib/mysql'.
174908:save:Saving the backup data in the pool 'datadomainlocaldomain'.
175019:save:Received the media management binding information on the host 'win-gk5eesvvbji'.
174910:save:Connected to the nsrmmd process on the host 'win-gk5eesvvbji'.
175297:save: Unable to set up the direct save with server 'win-gk5eesvvbji': retry needed.
180569:save: Identified a save for the backup with PID-122428 on the client 'localhost'. Updating the total number of steps from 7 to 6.
174920:save: Step (3 of 6) for PID-122428: Contacting the NetWorker server through the nsrd process to obtain a handle to the target media device through the nsrmmd process for the save set '/var/lib/mysql'.
174908:save:Saving the backup data in the pool 'datadomainlocaldomain'.
175019:save:Received the media management binding information on the host 'win-gk5eesvvbji'.
174910:save:Connected to the nsrmmd process on the host 'win-gk5eesvvbji'.
175297:save: Unable to set up the direct save with server 'win-gk5eesvvbji': retry needed.
180569:save: Identified a save for the backup with PID-122428 on the client 'localhost'. Updating the total number of steps from 7 to 6.
174920:save: Step (3 of 6) for PID-122428: Contacting the NetWorker server through the nsrd process to obtain a handle to the target media device through the nsrmmd process for the save set '/var/lib/mysql'.
174908:save:Saving the backup data in the pool 'datadomainlocaldomain'.
175019:save:Received the media management binding information on the host 'win-gk5eesvvbji'.
174910:save:Connected to the nsrmmd process on the host 'win-gk5eesvvbji'.
175297:save: Unable to set up the direct save with server 'win-gk5eesvvbji': retry needed.

之前networker服务器断过一次网络，后来重启了，备份计划都顺利起来了，但就是一直不成功