Sonicwall TZ170 drops connection on LAN side

if it's just one host on the LAN not receiving replies, I doubt it's a sonicwall problem, anyway: check the logs and arp entries on the sonicwall. make sure your client *is* getting a valid dhcp adress, and that there aren't any duplicates,

also: do you have some firewall, anti-something on that particular client?

Thank M for you reply

I have checked the client and it does have a valid ip address, cause when it cannot ping the sonicwall, it can ping the the sbs 2003 server. other clients can ping both, when this client cannot only ping the sonicwall.

I have not tried to ping from the sonicwall to the the failed client to see if this is working.

When i renew the dhcp sometimes that fixes it, but only for a short while, if i unplug the nic cable and reconnect it again that fixes it for a short while.

what should i be looking for in the arp table on the sonicwall

Cheers

sonicwall problem, anyway: check the logs and arp

any duplicates,

Niall: Here are some things I would check a. does the client have any static network configuration settings? b. try the problem client on different switch port on your firewall/ switch?

I had a similar issue with a friend of mine two days,who was trying to connect his laptop to his high speed cable connection...client would obtain a valid ip address fine from the approved network range but could not go anywhere on the internet...checked every possible setting/ configuraiton on his ie but did not find anything...finally it clicked on me to check his network card setting and there was the problem, apparently his son had used the laptop at college and had set a static dns entry.....after 2+ hours (of free work)....

so, give it try... Julio (somerset, pa)

Cheers J

I will give that a try, that was the next thing i was going to do, change port on switch.

I am also going to give the client a static ip address,

Niall

check if the sonicwall has an arp entry for the client mac, meaning they can "see" each other on layer 2

Cheers Mak

I will check that out and let you know