Controller Rejected Image Download As Maximum Concurrent Download Limit Has Reached

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Karly Ruwet

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Jan 20, 2024, 4:48:24 AM1/20/24

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Pretty sure the ME "controller" AP doesn't have the lightweight firmware image needed for the other AP's to join OR the image is not availabl;el on the TFTP server entered into the DHCP/IP address settings entered into the AP's that are trying to join.

Last time I did a ME deployment I found out that the ME AP doesn't have any firmware for AP's at all. They have to be added to a TFTP server. This is different when using a hardware controller which has all appropriate firmware images already loaded.

controller rejected image download as maximum concurrent download limit has reached

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I have an 1852i running in mobility express mode. I am having trouble getting additional AP to join the controller. I can see the access points listed in the ME management but they will not join. The error I receive " AC rejected join request" "controller rejected image download as maximum congruent predownload limit has reached"

I have the same issue, but controller was 1830 and running image 8.4 which i later upgraded to 8.5 suggested release but still AP is not getting registered. note in 8.5 I m not getting error to join next WLC.

In a large wireless network, preloading the image to the access point may be something of interest to you. This process will lessen the overall downtime of your wireless network during the upgrade process. By preloading a new image to the access points in advance, negates the need to wait for your controllers to update the access points individually, which prolongs the upgrade process.

When you do a preload push there is a maximum number of concurrent predownloads. It is limited to half the number of concurrent normal image downloads (10 normally / half is 5). The access points not taking the download will then receive a random timer between 180 and 600 seconds. So this means your 4400s will do a preload of 5 access points at a time. The other 95 receive back off timers.

Bob is the username of an account from the Active Directory Domain which is connected and joined to ISE server. User Maximum Sessions is configured with value 2, which means that any session for same user beyond this number is not permitted (per PSN).

As shown in the image, user Bob connects with Android Phone and Windows machine with the same credentials:

Both sessions are permitted because maximum sessions limit is not exceeded. See detailed Radius Live log, shown in the image:

When Alice and Pablo are connected to the network, they exceed the session limits for both groups. Veronica, who belongs only to GroupTest1 and Peter, member of GroupTest2 are unable to connect because of Max Session for Group reached the maximum configured value:

In order to limit the Guest Access, you can specify the Maximum simultaneous logins in the Guest Type configuration.

Navigate to Work Centers > Guest Access > Portal & Components > Guest Types and change Maximum simultaneous logins option, as shown in the image:

When the limit can be adjusted, the tables include Default limit and Maximum limit headers. The limit can be raised above the default limit but not above the maximum limit. Some services with adjustable limits use different headers with information about adjusting the limit.

When a service doesn't have adjustable limits, the following tables use the header Limit without any additional information about adjusting the limit. In those cases, the default and the maximum limits are the same.

The terms soft limit and hard limit often are used informally to describe the current, adjustable limit (soft limit) and the maximum limit (hard limit). If a limit isn't adjustable, there won't be a soft limit, only a hard limit.

7If you scale a Windows app in the Basic tier to two instances, you have 350 concurrent connections for each of the two instances. For Windows apps on Standard tier and above, there are no theoretical limits to WebSockets, but other factors can limit the number of WebSockets. For example, maximum concurrent requests allowed (defined by maxConcurrentRequestsPerCpu) are: 7,500 per small VM, 15,000 per medium VM (7,500 x 2 cores), and 75,000 per large VM (18,750 x 4 cores). Linux apps are limited 5 concurrent WebSocket connections on Free SKU and 50k concurrent WebSocket connections per instance on all other SKUs.

A search service is constrained by disk space or by a hard limit on the maximum number of indexes or indexers, whichever comes first. The following table documents storage limits. For maximum object limits, see Limits by resource.

Azure Data Factory is a multitenant service that has the following default limits in place to make sure customer subscriptions are protected from each other's workloads. To raise the limits up to the maximum for your subscription, contact support.

When a given resource or operation doesn't have adjustable limits, the default and the maximum limits are the same. When the limit can be adjusted, the following table includes both the default limit and maximum limit. The limit can be raised above the default limit but not above the maximum limit. Limits can only be adjusted for the Standard SKU. Limit adjustment requests are not accepted for Free SKU. Limit adjustment requests are evaluated on a case-by-case basis and approvals are not guaranteed. Additionally, Free SKU instances cannot be upgraded to Standard SKU instances.

AMQP: 50 charactersNumber of non-epoch receivers per consumer group-5Number of authorization rules per namespaceSubsequent requests for authorization rule creation are rejected.12Number of calls to the GetRuntimeInformation method-50 per secondNumber of virtual networks (VNet)-128Number of IP Config rules-128Maximum length of a schema group name50Maximum length of a schema name100Size in bytes per schema1 MBNumber of properties per schema group1024Size in bytes per schema group property key256Size in bytes per schema group property value1024Basic vs. standard vs. premium vs. dedicated tiersThe following table shows limits that may be different for basic, standard, premium, and dedicated tiers.

You can publish events individually or batched.The publication limit (according to SKU) applies regardless of whether it is a single event or a batch. Publishing events larger than the maximum threshold will be rejected.

1 The maximum size supported for a single blob is currently up to 5 TB in Azure Blob Storage. Additional limits apply in Media Services based on the VM sizes that are used by the service. The size limit applies to the files that you upload and also the files that get generated as a result of Media Services processing (encoding or analyzing). If your source file is larger than 260-GB, your Job will likely fail.

We have increased all default limits to their maximum limits. If there's no maximum limit column, the resource doesn't have adjustable limits. If you had these limits manually increased by support in the past and are currently seeing limits lower than what is listed in the following tables, open an online customer support request at no charge

Azure Synapse Analytics has the following default limits to ensure customer's subscriptions are protected from each other's workloads. To raise the limits to the maximum for your subscription, contact support.

The following table illustrates the default and maximum limits of the number of resources per region per subscription. The limits remain the same irrespective of disks encrypted with either platform-managed keys or customer-managed keys. There is no limit for the number of Managed Disks, snapshots and images per resource group.

For unmanaged disks, you can roughly calculate the number of highly utilized disks supported by a single standard storage account based on the request rate limit. For example, for a Basic tier VM, the maximum number of highly utilized disks is about 66, which is 20,000/300 IOPS per disk. The maximum number of highly utilized disks for a Standard tier VM is about 40, which is 20,000/500 IOPS per disk.

When working with VM applications in Azure, you may encounter an error message that says "Operation could not be completed as it results in exceeding approved UnmanagedStorageAccountCount quota." This error occurs when you have reached the limit for the number of unmanaged storage accounts that you can use.

There are situations where you want to fail a Job after some amount of retriesdue to a logical error in configuration etc.To do so, set .spec.backoffLimit to specify the number of retries beforeconsidering a Job as failed. The back-off limit is set by default to 6. FailedPods associated with the Job are recreated by the Job controller with anexponential back-off delay (10s, 20s, 40s ...) capped at six minutes.

Note that a failing index does not interrupt execution of other indexes.Once all indexes finish for a Job where you specified a backoff limit per index,if at least one of those indexes did fail, the Job controller marks the overallJob as failed, by setting the Failed condition in the status. The Job getsmarked as failed even if some, potentially nearly all, of the indexes wereprocessed successfully.

You can additionally limit the maximal number of indexes marked failed bysetting the .spec.maxFailedIndexes field.When the number of failed indexes exceeds the maxFailedIndexes field, theJob controller triggers termination of all remaining running Pods for that Job.Once all pods are terminated, the entire Job is marked failed by the Jobcontroller, by setting the Failed condition in the Job status.

Note that a Job's .spec.activeDeadlineSeconds takes precedence over its .spec.backoffLimit.Therefore, a Job that is retrying one or more failed Pods will not deploy additional Pods onceit reaches the time limit specified by activeDeadlineSeconds, even if the backoffLimit is not yet reached.