Symantec Gateway Security Appliance 440 (10278186) "sonicwall error" Questions

...I experienced a similar error through a SonicWall with GatewayAV (no proxy, just the Sonic) and had to enable HTTP byte-range requests. This can happen to both server and client BITS

i am using sonic TZ190 Firewall and unable to access yahoo.com mails the page is not displaying contents I have determined that the problem is actually 69.147.112.160, which seems to be a login server