cannot connect to vmd(70)

Hello,

We have to perform a move of our servers... and we would like to remove a switch which is seems to be not necessary. The second network card of the servers are connected on it with a specific IP adress.  

But this night backups didn't start. And we i go into the Netbackup Administration console i have this error message CANNOT CONNECT TO VMD(70) and I'm not able to see the clients... 

I don't know what is this. Could you help me please ? 

Thanks