Unisphere Storage Manager Plugin Proxy Message

Hi,

If possible I need help to troubleshoot the message that appears when I try to enable the EMC plugin from my vsphere client.

On logs, this is the only message that I found:

2014-05-23 13:05:43,600 [6104] [ClientUIThread] INFO  EMC.VSI.Core.FeatureInfo`2[[VMware.VIClient.Plugins2.Plugin, VIPlugins2, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7c80a434483c7c50],[VMware.VIClient.Plugins2.ExtensionContext, VIPlugins2, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7c80a434483c7c50]] - Unloaded feature instance "EMC.Solutions.VMware.Unified.NfsPlugin" from "vmware_nfs.dll"

2014-05-23 13:06:05,300 [6104] [ClientUIThread] ERROR EMC.VSI.Core.FeatureInfo`2[[VMware.VIClient.Plugins2.Plugin, VIPlugins2, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7c80a434483c7c50],[VMware.VIClient.Plugins2.ExtensionContext, VIPlugins2, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7c80a434483c7c50]] - Error loading feature instance "EMC.Solutions.VMware.Unified.NfsPlugin" from "vmware_nfs.dll"

System.Reflection.TargetInvocationException: Se produjo una excepción en el destino de la invocación. ---> System.Net.WebException: Error en el servidor remoto: (407) Se requiere autorización del proxy.

The strange thing here is that the installation works fine for a couple of days, and after that the message start to appear. There were no changes on proxy or something related to this.

Many thanks,