Problem of bandwidth with Windows 7 32 bit

I am facing a strange problem with my laptop. I have to use putty to connect to
AIX servers but when I login into the server through putty then any command
whose output is more than 20 lines hang that session indefinately. Same way, if
I use FTP on cmd prompt & try to get a file from server to my laptop, it
doesn't work & the session get hanged everytime.

I have tried with new putty setup's many times but same result.

Can anyone please help me in this?

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