Ernandez, any additional detail you can provide would be helpful. What version of XNAT were you running previously? Are you seeing any entries in {XNAT_HOME}/logs/dicom.log when you attempt to send data?
Also, when you say that the DQR plugin does not work, are you referring only to receiving DICOM data, or are there other elements of the plugin that are failing?
Since you are using the DQR plugin, how many SCP receivers do you currently have configured in your XNAT?
Any additional details you can provide that would help someone recreate the issue would be helpful.
Regards,
Will