Unable to connect the MR6450 to my Epson ET8500 and Brother DCP-L2530DW over wireless WIFI?

Hello,

I just got the MR6450 which I connected without problems to my Laptop Acer Aspire 5 , but I am unable to connect the MR6450 to my two above mentionned printers?? Before I had both printers connected easily to an ASUS modem over wireless wifi....

Many thanks for your inputs and help!