Thank you for your reply. Tests on version 4.0.2: 1. I created a specific rule for smb and turned off security profiles - no change. 2. I turned on the functions DSRI for this rule - no change. 3. I created a rule for the specified App Override of traffic - no change. Next I made the upgrade to version 4.0.3 and have done the same tests: 1. Rule without profiles - no change. 2. The rule with DSRI feature enabled - no change. 3. App override rule for the specific traffic (with reference to the custom app on ports 137-139,445 tcp / udp) - trasnfer increased about 3x. Last activity definitely accelerated file transfers, but still it is about 10Mbps less than expected. Fortunately, employees can now work effectively on remote resources. Is there a problem with the definition of application ms-smb in signatures? Is this a hardware problem of PA5000 series? I've worked with all series of PA firewalls (PA500, PA2020, PA2050, PA4020, PA4050 and now PA5050) and it happens the first time. Message was edited by: darkfibre
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