Slow network performance

Forum Wireless Networking : Range & connectivity - Slow network performance

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Hi all , i have a strange problem
i had a disaster on a server that runing win 2003 ent and about 45 clients connected to it . before it was working like a charm but after i reinstalled it , a clean install , didnt format tho , just deleted the sys folder .
setup the active directory , dns and dhcp , and created active directory users and groups .
connected everyone and everything is ok , only one problem ... copying files or accessing it from shared folders is extremly slow .. and i solved that by going to clients pc and configure the lan to be 100 mb full duplex .

but this wasnt necessary before i reinstalled , what did i do wrong so i changed that ? i mean i need to make it auto coz some clients have wireless access and i cant set wireless to have 100 mb full duplex . is there anything i should check ?

one more question , when i run the dns test dcdiag /test:dns i get everything working fine but it says forwarder fail .

please help

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This topic has been moved from the section TomsNetworking to section Wireless Networking by R_manic

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