Sangfor Community»Categories Activity Zone Ongoing Activities Round 6 | Read, Rate and Reward - Help Us Improve.

Round 6 | Read, Rate and Reward - Help Us Improve.

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Created: 2026-Jul-13 09:34

Summary:

Reminder: 1) To qualify for the activity reward, all participants must submit authentic reviews or feedback before commenting "I joined". 2) Fake, repetitive, meaningless replies will not be count ...

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Rence Posted 2026-Jul-15 09:28
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ND Posted 2026-Jul-14 15:54
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Samianto Posted 2026-Jul-14 14:37
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masih_pemula Posted 2026-Jul-14 11:42
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Hendra Mustopa Posted 2026-Jul-14 11:40
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Enrico Vanzetto Posted 2026-Jul-13 22:47
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pmateus Posted 2026-Jul-13 17:24
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Clarence Roque Posted 2026-Jul-13 13:27
Case 1:

When IPsec VPN Phase 1 is established but Phase 2 fails, check the following:

Verify Phase 2 Parameters
Ensure both VPN peers use the same:
Encryption algorithm (AES-128, AES-256, etc.)
Authentication algorithm (SHA-1, SHA-256, etc.)
Perfect Forward Secrecy (PFS) settings
Diffie-Hellman (DH) Group
SA Lifetime
Check Encryption Domains (Local and Remote Subnets)
Confirm that the local and remote protected networks match exactly on both VPN endpoints.
Incorrect subnet definitions are one of the most common causes of Phase 2 failure.
Review Security Policies
Verify that firewall or security policies allow traffic between the local and remote subnets.
Check Routing
Ensure routes exist for the remote network and traffic is correctly directed to the IPsec tunnel.
Inspect NAT Configuration
Make sure VPN traffic is excluded from NAT (No-NAT policy) if required.
Review VPN Logs
Check NGAF logs or debug information for Phase 2 negotiation errors such as:
Proposal mismatch
Traffic selector mismatch
PFS mismatch
Lifetime mismatch
Verify Peer Configuration
Confirm both VPN peers have identical Phase 2 settings and that the tunnel is configured correctly on both sides.

Case 2:

To troubleshoot intermittent network disconnections on Sangfor NGAF, perform the following checks:

Check Physical Interfaces
Verify interface status, link speed, duplex settings, and cable connections.
Ensure there are no interface errors or packet drops.
Monitor Interface Statistics
Check for CRC errors, collisions, packet loss, or high bandwidth utilization.
Review Firewall Policies
Ensure security policies are correctly configured and not unintentionally blocking traffic.
Check Routing Configuration
Verify default routes, static routes, and dynamic routing status.
Inspect NAT Policies
Confirm NAT rules are correctly configured and not affecting network connectivity.
Review System and Traffic Logs
Analyze logs for link flapping, session timeouts, policy denies, or hardware events.
Check Session Table
Verify active sessions and ensure the session table is not full.
Monitor Resource Utilization
Check CPU, memory, and session usage for abnormal spikes.
Verify HA Status (if applicable)
Ensure High Availability synchronization is normal and no failover events are occurring.
Check Blacklist/Whitelist Settings
Verify IP reputation, blacklist, or protection policies are not blocking legitimate traffic.
Use Packet Capture and Diagnostic Tools
Capture packets on the affected interfaces to identify where packets are being dropped.
Verify Endpoint Connectivity
Test client devices, gateway configuration, DNS resolution, and network adapters.
Review Recent Configuration Changes
Identify any recent policy, routing, firmware, or network changes that may have introduced the issue.