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About openfire login question

i meet a curious question.,please help me!!

when my programe login openfire server, sometimes openfire will not any response and here i open iexplore to login openfire webs adminconsole,it also does not have any response with waiting long time. this thing often happens, but all logs files dont report errors. i dont know why the reason is, please anyone who knows the case help me ,i `ll appreciate!!!