Download Error Host Unavailable ((NEW))
Lida Humbert
Hello everyone, I have the same problem with my iPad Pro. Have now also tried with the split screen but there is still the message that the host is not available. With split screen, does it matter whether I have it in portrait or landscape format? I hope you can help me so that I can finally download videos on my IPad.
I have a Function App in azure and when I hit the URL of the function app it says "Function host is not running."I am not sure where I have to check and what needs to be changed.I tried restart but still no luck.
This usually means that there is some bad configuration in your function app which is causing the host to fail to start up. Things like having an invalid host.json or an invalid proxies.json file are a possible cause.
To diagnose, it's best to look at the function host logs. If you open your function app in the Azure portal and turn on log streaming, you should be able to get more information about what's going on.
We have a cluster built in vCenter 5.1 that is made up of 8 hosts. All are Cisco B200 M3s. 4 of which were recently stood up. I am having problems with these new 4 in that they will not fully accept the host profile that is attached to the cluster level for these hosts. The host profile that is built for this cluster is really just to apply the network configuration to new hosts added to this cluster. Unfortunately, for these new hosts it says it has applied this Host Profile but none of the network configurations are being applied and they are being shown as noncompliant with a reason of "Host is unavailable for checking compliance." Thanks for any assistance.
In my case, the Reference Host for the profile had been misplaced somehow. A reference host was still listed on the profile's Summary tab, but an error message declared that no reference host was configured for the profile.
This is quite odd...right now I spent more time messing around with the profiles than they can ever save me compared to manual configuration. Also just to mention: I want to join 18 hosts to the same domain ... have to enter the same username and password 18 times for the answer file. Not very smart...
The Host Profile Compliance Check cannot complete if the VMkernels that exist on each host aren't aligned, (they have to have the same vmk#s). For instance a host's kernel for management is on vmk1 on one host and the reference host for the host profile has its management kernel on vmk0 (which is written to the host profile) then the first host will be unavailable for compliance checks. This will be true for ALL VMkernels!!! vMotion, iSCSI, FTlogging, ...etc. It was a standard VMkernel that I was using for the Cisco N1kV that got me. Somehow all but two hosts had a kernel named vmk3 for this while two hosts had vmk2. I had to make sure they all were the same name, (vmk2), and the compliance check came back normal for all hosts.
In case anyone looks at this thread, find that their vmk interfaces are lined up, but it still gives you the "Host is unavailable for checking compliance" error. The problem occurred for me because I had disabled IPv6 on my reference host, but not the others. Once I disabled IPv6 on the rest of the hosts and reboot them, hosts profiles started working.
A request timeout error means that your request was received, but the host took too long to respond. A destination host unreachable error, on the other hand, means that your request couldn't reach the host.
A host interface is treated as unreachable after a failed check (network error, timeout) by Zabbix, SNMP, IPMI or JMX agents. Note that Zabbix agent active checks do not influence interface availability in any way.
The UnreachablePeriod parameter defines how long the unreachability period is in total. By default UnreachablePeriod is 45 seconds. UnreachablePeriod should be several times bigger than UnreachableDelay, so that an interface is rechecked more than once before an interface becomes unavailable.
and in the frontend the host availability icon goes from green/gray to yellow/red (the unreachable interface details can be seen in the hint box that is displayed when a mouse is positioned on the host availability icon):
In their HTTP HOST header I see --> testservice.mydomain.com:443.
To replicate that I created a test C# client and manually set the HOST header to include 443 port in request. I get the same error and nothing gets logged in IIS Website logs. Similarly in SOAPUI if I hit URL: :443/WcfService.svc (have to do this as can't manually change HOST header in SOAPUI) same Service Unavailable error is returned.
Our network team resolved the issue. It was a problem with how the Netscaler was configured; somehow it was not passing on the requests -which had port number in header, to correct IP (where the WebService was hosted).
Sorry I can't explain NetScaler resolution in detail. I twice asked the network people and their explanation went way over my head. But in any case, if anyone has similar problem, check out your Loadbalancer, DNS and Firewall settings.
We are doing autoscaling and whenever we scale down instances we are receiving host or monitoring unavailable alert and we don't that alert to be triggered in this scenario.Can you please help us how can we disable alert.
Only way I have in mind is maintenance window. During scaling down, you can send request to DT to fire up maintenance window that will cover those hosts that will be disconnected. Than do scaling down, after few minutes disable maintenance window. This is really dirty workaround but I don't have other idea for now.
How exactly are you "descaling" your environment? Probably the best approach would be to uninstall the agents before shutting down the instances. Then you would not get the problems about unavailable hosts.
Globally, change your settings to not alert on graceful shutdowns and have your hosts shutdown gracefully. This will then not alert you when the host is shutdown. You can also go into the settings page and disable the one agent on the host prior to the auto scaling.
There are different ways that this could be resolved, one of which is to add your hostname as localhost in /etc/hosts (as shown in several other answers). This may be the right thing to do in general, but it isn't the only possible resolution.
A "fully qualified domain name" may be supplied by an external DNS server or similar (if such is available on your network). In this case, sudo will not complain, despite the missing entry in /etc/hosts.
I spent 30min fighting with this error after editing my hostname and hosts files and running sudo service hostname restart until I ran sudo hostname and saw that the hostname was the new value, even though the prompt was showning the old value.
In my case it was the problem, I changed the hostname to man because I wanted to know if there are some parameters you can use on hostname. Instead it changed my hostname to man and I always got the same message like you
Fly.io has multiple hosts (physical hardware) in every supported region. From time to time, a hardware failure, connectivity issues, or other factors will make a host unavailable. A single-host issue may cause a sustained or intermittent outage, or generally degraded performance, and this will disproportionately affect apps that run on a single Machine.
For production apps, or any apps that require high availability, we strongly recommend redundancy to protect against single-host failure. This means running multiple Machines, and for stateful apps it means having a clustering mechanism (such as those built into LiteFS and Postgres, for example) to replicate data between multiple volumes, because volumes are pinned to specific hosts.
Fly.io strongly recommends running at least two Machines per app in your primary region and we have features that can help make app availability and resiliency more affordable. When possible, we place volumes on different hosts in the primary region. If one host goes down, then your app will still have a Machine and volume on a healthy host.
I have been working on a small project for an internal network to get JupyterHub running. I have gotten pretty far in the development, but now stuck on getting HTTPS working with the host network option.
For function apps that run on Linux in a container, the Azure Functions runtime is unreachable error can occur as a result of problems with the container. Use the following procedure to review the container logs for errors:
When the container image can't be found, you'll see a manifest unknown error in the Docker logs. In this case, you can use the Azure CLI commands documented at How to target Azure Functions runtime versions to change the container image being referenced. If you've deployed a custom container image, you need to fix the image and redeploy the updated version to the referenced registry.
Starting with version 3.x of the Functions runtime, host ID collision are detected and logged as a warning. In version 4.x, an error is logged and the host is stopped. If the runtime can't start for your function app, review the logs. If there's a warning or an error about host ID collisions, follow the mitigation steps in Host ID considerations.
Performing a CMD ping test can measure your latency, check the network connectivity of your computer, and tell you the quality of your connection. However, lots of people receive the destination host unreachable error when they ping test for an IP address.
Step 3. If it still shows the destination host unreachable error, the problem may be related to the remote gateway handling the request. To rule out this, you can run the traceroute command.
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