Error map
Instance reachability check failed EC2 status check failed: Instance reachability check failed (1/2 checks passed)
AWS · layer 6, Platform & cloud
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
An error occurred (UnauthorizedOperation): You are not authorized to perform this operation. Encoded authorization failure message: ...
The IAM identity is missing an EC2 (or related) permission. The encoded message tells you exactly which action and resource were…
Azure VM: OSProvisioningTimedOut — OS Provisioning for VM did not finish in the allotted time
The VM booted but its guest agent didn’t report provisioning success in time — usually a generalisation problem with a custom ima…
InsufficientInstanceCapacity: We currently do not have sufficient capacity in the Availability Zone you requested
AWS has no free capacity for that instance type in that Availability Zone right now.
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
The kernel booted but couldn’t mount the root filesystem — usually a missing or broken initramfs after a kernel update.
VcpuLimitExceeded: You have requested more vCPU capacity than your current vCPU limit
Your account’s On-Demand (or Spot) vCPU quota for that instance family and region is used up.
InvalidAMIID.NotFound: The image id '[ami-xxxx]' does not exist
The AMI ID isn’t available in this region/account — AMI IDs are regional and private AMIs must be shared.
mount: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program
mount couldn’t mount the device — the filesystem type isn’t supported/installed, the partition is wrong, or the filesystem is dam…
error: unknown filesystem. Entering rescue mode... grub rescue>
GRUB can’t find or read the partition holding its files — common after resizing/deleting partitions or installing Windows alongsi…
Blue screen: INACCESSIBLE_BOOT_DEVICE (0x0000007B)
Windows lost access to the system drive during boot — storage driver/controller mode change, failed update, or disk/BCD problems.
Your PC needs to be repaired: The Boot Configuration Data file is missing some required information (0xc000000f)
Windows Boot Manager can’t find a valid BCD entry or boot files — after disk changes, failed updates, cloning or dual-boot change…
Automatic Repair couldn't repair your PC — Log file: C:\Windows\System32\Logfiles\Srt\SrtTrail.txt
Windows failed to boot repeatedly and Startup Repair couldn’t fix it; SrtTrail.txt records the root cause it found.
InvalidKeyPair.NotFound: The key pair 'x' does not exist
The key pair name you passed doesn’t exist in that region (key pairs are regional).
Two steps away (31)
AWS S3: AccessDenied (403) when calling GetObject / PutObject
An IAM policy, bucket policy, ACL/ownership setting, Block Public Access or KMS key policy denied the S3 request.
PERMISSION_DENIED: The caller does not have permission (insufficient permissions)
You are authenticated, but your identity isn’t allowed to perform this action on this resource.
AccessDeniedException: User: arn:aws:iam::... is not authorized to perform: service:Action on resource: ...
The IAM user or role making the call has no permission for that action on that resource — the message names both.
Kubernetes: ImagePullBackOff / ErrImagePull
The node can’t pull the container image — wrong name/tag, missing registry credentials, or registry unreachable.
exec /usr/local/bin/docker-entrypoint.sh: exec format error
The container tried to run a binary built for a different CPU architecture (arm64 vs amd64) — or a script with a broken shebang /…
Fatal error: Uncaught Error: Call to undefined function imagecreatefromjpeg()
The GD extension (or its JPEG/WebP support) isn’t installed for the PHP version serving the site.
HTTP 503 Service Unavailable
The server is temporarily unable to handle the request — overloaded, in maintenance, or has no healthy backends.
MySQL ERROR 1040 (08004): Too many connections
MySQL reached `max_connections` and refuses new clients.
Azure: SkuNotAvailable / QuotaExceeded when creating a VM or resource
The VM size isn’t offered in that region/zone for your subscription, or you’ve hit the vCPU quota.
Killed / Out of memory: Killed process (Linux OOM killer)
The kernel ran out of memory and killed a process to recover — the program just prints “Killed” (exit code 137).
bash: /bin/rm: Argument list too long
A glob like * expanded to more file names than the kernel allows in one command (ARG_MAX), so the command never ran.
cannot execute binary file: Exec format error
The program was built for a different CPU architecture or OS — e.g. an x86_64 binary on an ARM machine (Raspberry Pi, Graviton, A…
AWS: ThrottlingException / Rate exceeded
You exceeded the request rate for an AWS API; retry with exponential backoff.
HTTP 402 Payment Required
The service wants payment before it will process the request — an unpaid invoice, exhausted credits or a failed card.
Error creating: pods is forbidden: exceeded quota: compute-resources, requested: limits.memory=1Gi, used: ..., limited: ...
The namespace’s ResourceQuota doesn’t have room for the new pod’s requests/limits (or object count).
S3 PermanentRedirect: The bucket you are attempting to access must be addressed using the specified endpoint
The request went to the wrong S3 region/endpoint for that bucket.
DynamoDB ResourceNotFoundException: Requested resource not found (table)
The table (or index) doesn’t exist in the region/account the client is using.
SQS: The specified queue does not exist (AWS.SimpleQueueService.NonExistentQueue / QueueDoesNotExist)
The queue URL/name doesn’t exist in that region/account, or it was deleted (recently deleted names are blocked for 60 seconds).
Error: ENOENT: no such file or directory
A file or directory the program tried to open doesn’t exist at that path.
java.io.FileNotFoundException: config.properties (No such file or directory)
Java couldn’t open the file — wrong path relative to the working directory, missing file, or a classpath resource read as a file.
java.nio.file.NoSuchFileException: /path/file
An NIO Files operation targeted a path that doesn’t exist.
bash: command not found
The shell can’t find an executable with that name in any directory on your PATH.
E: Could not get lock /var/lib/dpkg/lock-frontend — is another process using it?
apt can’t run because another package operation (often automatic updates) holds the dpkg lock.
fork: Cannot allocate memory / ENOMEM
The kernel refused a memory allocation — RAM and swap are exhausted, or overcommit/cgroup limits block it.
Blue Screen: CRITICAL_PROCESS_DIED (Stop code 0x000000EF)
A process Windows can’t run without (csrss, wininit, smss…) stopped unexpectedly, so the system halted.
Blue screen: DPC_WATCHDOG_VIOLATION (0x00000133)
A driver spent too long at high priority (DPC level) — typically SSD/NVMe firmware, storage controller drivers (iaStorA.sys) or g…
Blue screen: WHEA_UNCORRECTABLE_ERROR (0x00000124)
The hardware reported an error Windows couldn’t recover from — CPU, RAM, overclock/undervolt, overheating or power delivery.
Windows Error 0x80070002: The system cannot find the file specified
A file or registry entry Windows expected is missing — common in Windows Update, backups and app installs.
Windows Error 0x80004005 (E_FAIL): Unspecified error
A generic failure code — the operation failed for a reason the component didn’t report precisely. Context decides the fix.
The User Profile Service failed the sign-in. User profile cannot be loaded.
Windows can’t load your profile — the profile registry entry or NTUSER.DAT is corrupt, or the Default profile is damaged.
LocationNotAvailableForResourceType / InvalidResourceLocation
The resource type isn’t offered in that region, or the resource already exists in a different region than the template says.
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