- Azure DNS public zone not resolving after delegation - NS records, registrar settings and record checksAzure · 12 Nov 2026
- OCI network security groups CLI cheat sheet - rules, VNIC membership and quick auditsOCI · 12 Nov 2026
- AWS Network Firewall dropping or passing the wrong traffic: rule order, default actions, asymmetric routing and idle timeoutsAWS · 11 Nov 2026
- Azure Firewall Premium TLS inspection rollout checklist: intermediate CA, Key Vault access, client trust and bypass listsAzure · 11 Nov 2026
- Azure Private Link Service troubleshooting: connections stuck Pending, NAT IP pressure and PROXY protocol breaking the backendAzure · 11 Nov 2026
- Cross-account service-to-service networking with VPC Lattice: service networks, IAM auth policies, SigV4 clients and the security group rules people missAWS · 11 Nov 2026
- Expanding into a second OCI region: a checklist for identity, limits, keys, images, networking and observabilityOCI · 11 Nov 2026
- OCI instance network throughput below the shape's bandwidth: testing with iperf3, SR-IOV vs paravirtualized and multi-flow tuningOCI · 11 Nov 2026
- OKE pods failing DNS lookups: CoreDNS scaling, ndots, custom forwarding and pod network security rulesOCI · 11 Nov 2026
- Route 53 Resolver DNS Firewall rollout checklist: alert-first, walled-garden allow lists, fail-open and org-wide deploymentAWS · 11 Nov 2026
- dnf update fails on an OCI Oracle Linux instance: regional yum server, ociregion variable and service gateway checksOCI · 10 Nov 2026
- LLM API calls fail with CERTIFICATE_VERIFY_FAILED behind a corporate proxy: CA bundles and proxy settings for the OpenAI SDK, boto3 and Azure SDKsAI & GenAI · 10 Nov 2026
- Azure Windows VM not activated: fixing KMS activation errors 0xC004F074 and forced-tunnel routingAzure · 9 Nov 2026
- OCI connections hang on large transfers: MTU 9000, path MTU discovery and MSS across gateways, VPN and FastConnectOCI · 9 Nov 2026
- OCI reserved public IPs: keep the same public address when you replace or rebuild an instanceOCI · 9 Nov 2026
- Small requests work but large transfers hang over Azure VPN or ExpressRoute - finding and fixing an MTU/MSS black holeAzure · 9 Nov 2026
- Lakehouse Federation to Azure SQL fails: timeouts, login errors, missing tables and no pushdownDatabricks on Azure · 8 Nov 2026
- AKS Service stuck with EXTERNAL-IP pending: identity, subnet and annotation checksAzure · 7 Nov 2026
- App Service can't reach a private endpoint after VNet integration: DNS, routing and NSG checksAzure · 7 Nov 2026
- Build your first AWS VPC with the CLI: subnets, route tables and an internet gatewayAWS · 7 Nov 2026
- Build your first OCI VCN with the CLI: public and private subnets, gateways and routesOCI · 7 Nov 2026
- Amazon Route 53 basics: hosted zones, records and safe DNS changes from the CLIAWS · 6 Nov 2026
- Azure Load Balancer SNAT port exhaustion: prove it, then fix it with outbound rules or NAT GatewayAzure · 6 Nov 2026
- Azure Traffic Manager endpoint shows Degraded: probe failures, redirects and host headersAzure · 6 Nov 2026
- OCI first load balancer: backends, health check and listener explained step by stepOCI · 6 Nov 2026
- OCI instance port open in the security list but still timing out: check firewalld and iptablesOCI · 6 Nov 2026
- OCI Load Balancer 502 and 504 on long requests: tune idle timeout and backend keep-aliveOCI · 6 Nov 2026
- Azure API Management returns 401, 404 or 500: find the failing stage and fix itAzure · 5 Nov 2026
- Interface VPC endpoint not working: private DNS, security groups and endpoint policiesAWS · 5 Nov 2026
- Kafka clients connect, then time out: fixing advertised.listeners and bootstrap metadataData Platform · 5 Nov 2026
- NSG flow logs retire in September 2027: move to VNet flow logs and rewrite your queriesAzure · 5 Nov 2026
- VPC subnet out of IP addresses: find what's using them and add capacityAWS · 5 Nov 2026
- Azure VNet peering is Connected but traffic does not flow: states, routes, NSGs and transitAzure · 4 Nov 2026
- Network Load Balancer connections time out or reset: client IP preservation, hairpinning, security groups and idle timeoutAWS · 4 Nov 2026
- OCI VCN flow logs: prove which security rule is dropping trafficOCI · 3 Nov 2026
- OKE LoadBalancer service stuck with EXTERNAL-IP pending: annotations, subnets, policies and limitsOCI · 3 Nov 2026
- S3 AccessDenied through a VPC gateway endpoint: endpoint policies, aws:SourceVpce and the buckets you forgotAWS · 3 Nov 2026
- Databricks serverless can't reach ADLS behind a firewall: 403 errors fixed with network connectivity configurations (NCC)Databricks on Azure · 2 Nov 2026
- Introduction to the OCI Service Gateway: reach Object Storage and OCI services from private subnets without internetOCI · 2 Nov 2026
- OCI Network Path Analyzer: find the route or security rule that blocks trafficOCI · 2 Nov 2026
- OCI Streaming: Kafka clients can't connect or authenticate - bootstrap servers, SASL usernames and auth tokensOCI · 2 Nov 2026
- OCI VCN peering connected but traffic doesn't flow: route tables, security rules and overlapping CIDRs for LPG and DRG peeringOCI · 2 Nov 2026
- Packet capture on Azure VMs with Network Watcher: prove where a connection failsAzure · 2 Nov 2026
- Sev1: Azure Front Door returns 502 or 503 for every request — origin health, host header and Private Link fixesAzure · 31 Oct 2026
- Sev1: Azure VPN Gateway site-to-site tunnel down — IKE, shared key, BGP and routing checks in orderAzure · 31 Oct 2026
- Sev1: OCI File Storage mounts hang or fail — security rules, export options and stale NFS handlesOCI · 31 Oct 2026
- Sev1: OCI load balancer returns 502 — every backend critical, health check and security rule fixesOCI · 31 Oct 2026
- Sev1: OCI private instances lost outbound access — NAT gateway, service gateway and route rule checksOCI · 31 Oct 2026
- Sev1: private subnets lost outbound internet — NAT gateway, route tables and port allocation errorsAWS · 31 Oct 2026
- Sev1: production VMs unreachable after an NSG or route table change — find the rule in minutesAzure · 31 Oct 2026
- Sev1: Unity Catalog tables fail with 403 after a storage firewall change — network rules for serverless and classic computeDatabricks on Azure · 31 Oct 2026
- Can't connect to a MySQL HeatWave DB system on OCI: network path, users and connection limitsOCI · 30 Oct 2026
- Lambda in a VPC can't reach the internet or AWS services: subnets, NAT, endpoints and security groupsAWS · 30 Oct 2026
- AKS networking deep dive: Azure CNI Overlay vs pod subnet, IP planning and egress at scaleAzure · 29 Oct 2026
- AWS PrivateLink for your own service: endpoint services, cross-account consumers and private DNSAWS · 29 Oct 2026
- New Azure VM can't reach the internet - private subnets, default outbound access and the explicit egress fixAzure · 29 Oct 2026
- Security groups vs network ACLs: AWS VPC firewall basics and how to debug a blocked connectionAWS · 29 Oct 2026
- Sev1: App Service outbound calls time out under load. SNAT port exhaustion triage and fixAzure · 29 Oct 2026
- ADLS firewall blocking Azure Databricks: 403 AuthorizationFailure from classic clusters, Unity Catalog and serverless - resource instance rules, subnets and NCCsDatabricks on Azure · 28 Oct 2026
- Asymmetric routing through NVAs behind an Azure internal load balancer: dropped sessions, half-open TCP and how to make flows symmetricAzure · 28 Oct 2026
- EC2 packet drops with no obvious cause: ENA bandwidth, PPS, conntrack and link-local allowance exceededAWS · 28 Oct 2026
- OCI DRG routes missing or wrong in hub-and-spoke: DRG route tables, import distributions and transit routing through a hub firewallOCI · 28 Oct 2026
- OCI Network Load Balancer with client IP preservation: connections that hang, hairpin traffic and asymmetric return pathsOCI · 28 Oct 2026
- OCI secondary VNIC or secondary private IP not reachable: configuring the Linux side with policy routingOCI · 28 Oct 2026
- OKE pods stuck in ContainerCreating with VCN-native pod networking: pod subnet exhaustion, VNIC limits and max pods per nodeOCI · 28 Oct 2026
- Traffic to private endpoints bypassing Azure Firewall: /32 routes, private endpoint network policies and SNATAzure · 28 Oct 2026
- Transit Gateway routing problems: asymmetric flows through inspection VPCs, appliance mode and blackhole routesAWS · 28 Oct 2026
- Azure Databricks IP access lists: restricting workspace access by network without locking yourself outDatabricks on Azure · 27 Oct 2026
- Lessons from the 30 September 2026 Azure gateway incident - making ExpressRoute and VPN connectivity survive a platform faultAzure · 27 Oct 2026
- Azure Bastion connection fails - fixing RDP/SSH sessions that won't open through BastionAzure · 26 Oct 2026
- Azure Databricks cluster can't reach a database or API: DNS, NSG, route and firewall checksDatabricks on Azure · 26 Oct 2026
- Azure DNS Private Resolver - hybrid DNS between on-premises and Azure without DNS forwarder VMsAzure · 26 Oct 2026
- EKS pods stuck in ContainerCreating - fixing pod IP exhaustion with VPC CNI prefix delegation and custom networkingAWS · 26 Oct 2026
- VPC Flow Logs in Athena - cheat sheet of queries for rejected traffic, top talkers and who reached whatAWS · 26 Oct 2026
- Advisory: ALB, NLB, API Gateway, CloudFront or Global Accelerator - choosing the AWS entry pointAWS · 25 Oct 2026
- Advisory: choosing the entry point on OCI - Load Balancer, Network Load Balancer, API Gateway, WAF and DNS steeringOCI · 25 Oct 2026
- Advisory: Front Door, Application Gateway, Load Balancer, Traffic Manager or API Management - choosing the traffic entry pointAzure · 25 Oct 2026
- Advisory: hybrid connectivity on AWS - Site-to-Site VPN, Direct Connect and resilient designsAWS · 25 Oct 2026
- Advisory: hybrid connectivity on OCI - FastConnect, Site-to-Site VPN and redundant designsOCI · 25 Oct 2026
- Advisory: networking for Databricks serverless on Azure - network connectivity configs, private endpoints and egress controlDatabricks on Azure · 25 Oct 2026
- Advisory: Private Link, service endpoints or public endpoints with firewall rules - a PaaS network access guideAzure · 25 Oct 2026
- Optimization: Azure Firewall policy clean-up, SKU choice and cost controlAzure · 25 Oct 2026
- Optimization: Azure VM performance tuning - size families, accelerated networking, caching and placementAzure · 25 Oct 2026
- Optimization: finding and reducing AWS data transfer costs - cross-AZ, inter-region and internet egressAWS · 25 Oct 2026
- Optimization: finding and reducing Azure networking costs - peering, private endpoints, NAT and egressAzure · 25 Oct 2026
- Optimization: right-sizing OCI load balancers - flexible bandwidth, Network Load Balancer and consolidationOCI · 25 Oct 2026
- Optimization: the hidden Azure costs around Databricks - ADLS transactions, private endpoints, NAT and cross-region trafficDatabricks on Azure · 25 Oct 2026
- Optimization: understanding and reducing OCI network costs - egress, service gateway and cross-region trafficOCI · 25 Oct 2026
- Sev1: Azure Databricks clusters fail to connect to the control plane — SCC relay and Private Link issuesDatabricks on Azure · 25 Oct 2026
- Sev1: Azure Databricks clusters won't start — VNet-injected subnets out of IP addressesDatabricks on Azure · 25 Oct 2026
- Sev1: chat answers arrive all at once or get cut off. Fixing LLM streaming behind proxies and gatewaysAI & GenAI · 25 Oct 2026
- EC2 instance not showing in Systems Manager: fixing SSM Agent registration and Session ManagerAWS · 24 Oct 2026
- OCI File Storage NFS mount hangs or fails with access denied: troubleshooting guideOCI · 24 Oct 2026
- Sev1: Azure Load Balancer marks every backend down — health probe and data path fixesAzure · 24 Oct 2026
- Sev1: OCI DNS record or private view changed — names stop resolvingOCI · 24 Oct 2026
- Sev1: private endpoints suddenly resolve to public IPs — private DNS zone link or record removedAzure · 24 Oct 2026
- Sev1: traffic stopped after an OCI security list or NSG change — find and revert it fastOCI · 24 Oct 2026
- Transformation: from self-managed hub-spoke to Azure Virtual WANAzure · 24 Oct 2026
- Transformation: move Azure PaaS from public endpoints to Private Link without an outageAzure · 24 Oct 2026
- High severity: subnet out of IP addresses (AKS scale-out, App Service, private endpoints failing)Azure · 23 Oct 2026
- Is an NSG blocking it? Azure network security group troubleshooting cheat sheetAzure · 23 Oct 2026
- Reaching private OCI instances with the Bastion service: managed SSH and port forwardingOCI · 23 Oct 2026
- ALB returning 502, 503 or 504: what each code means and how to fix itAWS · 22 Oct 2026
- Application Gateway 502 Bad Gateway: backend health troubleshootingAzure · 22 Oct 2026
- AWS network foundation: VPC design, Transit Gateway and centralised egressAWS · 22 Oct 2026
- AWS Site-to-Site VPN tunnel down or flapping: a runbookAWS · 22 Oct 2026
- Azure Files share won't mount: port 445, authentication and SMB version fixesAzure · 22 Oct 2026
- Azure hub-and-spoke network foundation with Azure Firewall and private DNSAzure · 22 Oct 2026
- Azure Private Endpoint DNS: why it still resolves to a public IPAzure · 22 Oct 2026
- Azure site-to-site VPN tunnel is down: a runbookAzure · 22 Oct 2026
- Azure Storage 403 errors: AuthorizationFailure, AuthorizationPermissionMismatch and SAS problemsAzure · 22 Oct 2026
- Can't connect to Autonomous Database: wallet, mTLS, ACL and ORA- errorsOCI · 22 Oct 2026
- Can't RDP to a Windows instance on OCI: password, ports and recoveryOCI · 22 Oct 2026
- Customer can't SSH to an EC2 instance: timeout vs refused vs permission deniedAWS · 22 Oct 2026
- Databricks cluster fails to start: termination reasons decodedData Platform · 22 Oct 2026
- EKS worker nodes not joining the clusterAWS · 22 Oct 2026
- Instances in private subnets lost internet access: NAT gateway troubleshootingAWS · 22 Oct 2026
- Is Azure Firewall blocking it? Finding the denied flow in the logsAzure · 22 Oct 2026
- OCI Load Balancer: backend health is CRITICALOCI · 22 Oct 2026
- OCI network foundation: hub-and-spoke with DRG, Network Firewall and private DNSOCI · 22 Oct 2026
- OCI Site-to-Site VPN (IPSec) tunnel down: runbookOCI · 22 Oct 2026
- OCI VCN routing: Internet, NAT, Service and DRG gateways explained for troubleshootingOCI · 22 Oct 2026
- OKE: nodes NotReady and pods stuck PendingOCI · 22 Oct 2026
- Two AWS resources can't talk: security groups, NACLs, routes and Reachability AnalyzerAWS · 22 Oct 2026
- Azure VM won't boot or accept RDP/SSH: a triage runbookAzure · 20 Oct 2026