Complete Techclick course list with transparent pricing: free lessons, ₹399 membership, ₹10,000 live trainings, ₹30,000 combo, ₹25,000 interview/migration tracks — plus student-friendly labs on ai.techclick.in.

End-to-end firewall migration, on-premises to cloud deployment, and configuration for Palo Alto, Check Point, Fortinet, and Forescout—plus hands-on training and Google AI agent implementation.

Proofpoint rewrites URLs. Some vendors sign the original URL and reject the rewritten one. Decode and add a targeted rewrite exception. Techclick CLI lab: symptoms, commands, traps, and proof.

Accept is RADIUS. The switch must apply the RFC 2868 attributes. Wrong dictionary or a local override leaves VLAN 1. Techclick CLI lab: symptoms, commands, traps, and proof.

Internet for Meraki cloud is not the same as Auto VPN to HQ. Use the local status page and event log for VPN registration. Techclick CLI lab: symptoms, commands, traps, and proof.

Umbrella only sees DNS it receives. A second resolver or a DoH browser bypasses your allow. Techclick CLI lab: symptoms, commands, traps, and proof.

PSM is a jump. Check the PSM server service, the connector account, and RDP/SSH from PSM to the target — not the user's laptop to the target. Techclick CLI lab: symptoms, commands, traps, and proof.

WAF logs name the rule (header length, JSON profile, file limit). Exception that URL/parameter. Do not put the VIP in bypass. Techclick CLI lab: symptoms, commands, traps, and proof.

Stateful firewalls drop the stray SYN-ACK. Draw both directions. Fix routing or enable state sharing. Do not add more allows. Techclick CLI lab: symptoms, commands, traps, and proof.

Forescout must be able to change the port (SNMP/CLI/RADIUS CoA). Compliance without a switch action leaves the old VLAN. Techclick CLI lab: symptoms, commands, traps, and proof.

A device is dropping DF large packets and not sending ICMP need-to-frag. Clamp MSS or fix MTU. This is the classic black hole. Techclick CLI lab: symptoms, commands, traps, and proof.

Containment cuts the host off except to the Falcon cloud. If that host was a path or a license server, the blast radius is bigger than one laptop. Techclick CLI lab: symptoms, commands, traps, and proof.

Prisma Access needs a healthy service connection / service connection to the DC. User tunnel up is not DC reachability. Techclick CLI lab: symptoms, commands, traps, and proof.

522 means Cloudflare could not TCP to origin. Origin firewall must allow Cloudflare IP ranges, and the origin port must match. Techclick CLI lab: symptoms, commands, traps, and proof.

Cloud NSG is not the guest firewall. nft list ruleset. A default drop on input explains everything. Techclick CLI lab: symptoms, commands, traps, and proof.

dig from a VLAN 40 host. If it times out to the forwarder but works when pointed at 8.8.8.8, the path to the corporate DNS is filtered or the helper is wrong. Techclick CLI lab: symptoms, commands, traps, and proof.

Outbound path is local-pref, weight, then AS-path, then MED. MED does not choose your exit unless those are equal. Techclick CLI lab: symptoms, commands, traps, and proof.

Type-5 only exists if the ASBR actually redistributes and the area is not a stub/NSSA without translation. Techclick CLI lab: symptoms, commands, traps, and proof.

Mutual redistribution without tags or filters loops. Tag on the way out, deny tagged on the way back. Techclick CLI lab: symptoms, commands, traps, and proof.

Stuck-in-Active means a query was not answered. Find the neighbor that did not reply and fix that link or stub it. Techclick CLI lab: symptoms, commands, traps, and proof.

Expert Information > Retransmissions and Dup ACKs. If they cluster one way, that path is dropping. It is not 'the internet'. Techclick CLI lab: symptoms, commands, traps, and proof.

Wrong interface, NIC offload, or you filtered the NAT'd address. Use -i any first, then turn off GRO/TSO for the capture. Techclick CLI lab: symptoms, commands, traps, and proof.

Idle is no TCP. Check update-source, neighbor IP reachability, and whether you are sourcing from the wrong loopback. Techclick CLI lab: symptoms, commands, traps, and proof.

EXSTART that never finishes is almost always MTU. ip ospf mtu-ignore is a bandage; matching MTU is the fix. Techclick CLI lab: symptoms, commands, traps, and proof.

DNAT needs a matching network rule, the right firewall public IP, and SNAT/return through the firewall. Policy hierarchy can hide a deny. Techclick CLI lab: symptoms, commands, traps, and proof.

Private endpoints need the privatelink DNS zone linked to the VNet. Without it, the public name never flips. Techclick CLI lab: symptoms, commands, traps, and proof.

502 is backend health. Probe path, host header, or NSG from the gateway subnet is wrong. Techclick CLI lab: symptoms, commands, traps, and proof.

Custom rules evaluate first. A sloppy contains() on a header will 403 a partner. List the custom rules before you disable OWASP. Techclick CLI lab: symptoms, commands, traps, and proof.

Connected is IKE. BGP is a second session on the tunnel. If BGP is down, Azure has no prefixes unless you also have traffic selectors. Techclick CLI lab: symptoms, commands, traps, and proof.

A NIC NSG, a subnet NSG, and an Application Security Group all stack. list-effective-nsg is the only merged view. Techclick CLI lab: symptoms, commands, traps, and proof.

show failover details the interface that is failed. A monitored data interface down keeps standby Failed even if LAN failover is up. Techclick CLI lab: symptoms, commands, traps, and proof.