We recently had a problem with our Sonicwall TZ-170 router and it was replaced with a brand new unit. I upgraded the firmware to the latest version and then imported the configuration back into the unit. Current firmware version is as follows;
Model: TZ 170 Standard
Firmware Version: SonicOS Standard 188.8.131.52-95s
ROM Version: SonicROM 184.108.40.206
We pull our email off of a server pop.mts.net and we send our mail out through mail.shawcable.com.
Both sending and receiving mail is painfull and usually times out. We use Outlook 2000 SP3, workstation is running Windows XP SP2. The sonicall is doing the DHCP.
Network WAN settings are as follows;
WAN Interface Settings: Auto Negotiate
Fragment non-VPN outbound packets larger than WAN MTU (checked off)
WAN MTU: 1500
Now, because we needed to keep our email running, I've pulled the sonicwall and put in a little Netgear RP114 router and we don't have any problems with email transfer at all
I also have no problem telneting into pop.mts.net either so the ports are working properly. We have this problem also when we use Outlook Express
Currently the MTU value 1500
Hope someone can help with this issue.