Problem in connection to server

hi

I have win server 2003 and 12 pcs as cleint ,

when i log on in any user it works correctly ,but i have two problems :
1) after about one hour if i dont use this user the connection is disabbled with the server and ask me for user name and password
2)after 9 hours the connection become very very slow until disconnect this connection,the message that appear to me
"\\server is not accessible,you might not have permition to use this network rescurce "
after that i need to make logon again to work correctly

(i have symantic antivirus corporation 10.1 and i update it always and scan all pcs ,no virus )

please tell me what is the problem as soon as possible

thanks

You are that somebody

What steps have you taken over the last couple days in an attempt to diagnose your problem? You haven't posted enough information for me to attempt even an educated guess.

might this be an issue with the leases expiring? Either that, or an on idle event security setting. I'll have to get on our server tomorrow and do a little digging around.... I know I saw something about that somewhere before.... As for now, my work here is done!! Woohoo go home time!!! I will comment back tomorrow after I've checked some things on our server for you to also check on yours.

i didnt change any thing over the last couple days this problem apeared suddenly but only we installed software for our company includeing my sql but i dont think the problem from it

My question was what debug steps have you already done to diagnose the cause of your problem?

the first step i did is to scan the server and the workstation after that i sure that no viruses in the system,then i opened user properties to check log on hours, but it was ok "sundy through sunday from 12:00 Am to 12:00 Am"
and i tried to put ip dynamic not automatic.....!! same problem, after that i tried to check cables ,i changed the cable for the server but also no way,and now i dont know what is the next step i have to do it.........................please help me

when it kicks you off the server, can you ping the server? Can you ping other computers? Are you using any routers? Firewalls? Switches/Hubs?

yes i can ping the server and other computer ,i am using access point router and two switches ,thats all for my network but today i opened domain security policy and i found in the kerberos policy there is option for maximum lifetime for service ticket it was default 600 m i changed to be 1200m and tomorow i will test this option maybe from it....what is your opinion?

I think it becomes ok today...
i dont have a problem today..
gooooooood
tomorrow i will test again

I kinda figured it was a timing issue (my initial thought was on leases, but there are a whole lot of other services with 2003 server) Given the fact that you can ping, means it is definitely a software issue, and as you have discovered, a timed setting in the active directory settings may have been the culprit. Regardless, good job on finding the problem...... when diagnosing server problems, I know it can be difficult at best. It's hard to diagnose other people's problems via the forums, as one never knows all of the diagnostics one has already went through.