Hi Friends can nay 1 help in solving this prob i install ISA server on my network sometimes it wokr good but sometimes when my users try to connect to net no connection established i dont know why i install ISA server in fire wall mode some times users facing too much deficulties in browsing and msn chating and yahoo can any 1 help in congiguring ISA server some times it also give error of 504 Gateway time out i am really worry about that so plz plz help me