Error fetching available IP Block networks

[aazherelyeu]

Hi,

For last couple of days I am experiencing "Error fetching available IP Block networks" error when trying to access "Associations" for some blocks. I am not sure what could be the root cause as it's not the issue for all blocks:

IPAM version: v3.4.0

[aazherelyeu]

In the app service logs I get 200 RC:
2025-05-29T13:26:29.7852894Z 2025-05-29 13:26:29.782 | INFO | uvicorn.protocols.http.httptools_impl:send:468 - 169.254.129.1:50729 - "GET /api/spaces/Space-GermanyWestCentral/blocks/Block-GWC-Dev/available?expand=true HTTP/1.1" 200

[DCMattyG]

Hey there @aazherelyeu, happy to help how I can here!

The Azure IPAM application itself runs inside your browser and nothing has changed from a code perspective in a while (although I am working on 3.6 now).

I see that you've shared the log from the Log Stream which shows that the service was returning a 200 to the browser call, so something that would be helpful for the next steps of troubleshooting would be to look at the error the browser is seeing. To do this you'll want to open the Web Developer Tools in whatever browser you're using, navigate to the "Networking" tab, and retry the operation in Azure IPAM. That way we can see what is going on from the browser perspective and even inspect the payload that is returned.

If this information is too sensitive to share on GitHub, you can always email me at Matthew.Garrett@microsoft.com. Additionally, I'm happy to schedule a working session with you to examine this personally. Just drop me and email and we can schedule a time that is most convenient for you.

Hope that helps!

[aazherelyeu]

Hi @DCMattyG I will drop you an email. Thanks

[aazherelyeu]

Hi Matthew, Did you have a chance to have a look into the issue? On Mon, 2 Jun 2025 at 13:45, Aliaksandr Azherelyeu ***@***.***> wrote:

…

Hi Matthew, From the "Network" tab I get subnets in the Response but get the following error in the Console: (also tried in different browsers) [image: image.png] *ERRORindex-BMTBgcpe.js:441 ------------------index-BMTBgcpe.js:441 TypeError: Cannot read properties of null (reading '0') at index-BMTBgcpe.js:441:71818 at index-BMTBgcpe.js:441:72546 at Array.forEach (<anonymous>) at index-BMTBgcpe.js:441:72527index-BMTBgcpe.js:441 ------------------* [ { "name": "adt-dev-pfu-vnet999", "id": "/subscriptions/002a92f2-ef0d-45b1-a845-9afc29c0ad2e/resourceGroups/adt-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/adt-dev-pfu-vnet999", "prefixes": [ "10.115.144.0/24" ], "resource_group": "adt-dev-pfu-rg999", "subscription_id": "002a92f2-ef0d-45b1-a845-9afc29c0ad2e", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "tom-dev-pfu-vnet999", "id": "/subscriptions/02d92097-6c06-43e8-8d96-08ce70b55e05/resourceGroups/tom-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/tom-dev-pfu-vnet999", "prefixes": [ "10.115.148.0/24", "10.115.149.0/24" ], "resource_group": "tom-dev-pfu-rg999", "subscription_id": "02d92097-6c06-43e8-8d96-08ce70b55e05", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "dip-dev-pfu-vnet996", "id": "/subscriptions/073ed249-df34-4948-b037-dc7340785d66/resourceGroups/dip-dev-pfu-rg996/providers/Microsoft.Network/virtualNetworks/dip-dev-pfu-vnet996", "prefixes": [ "10.115.252.0/22" ], "resource_group": "dip-dev-pfu-rg996", "subscription_id": "073ed249-df34-4948-b037-dc7340785d66", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "pdp-dev-pfu-vnet999", "id": "/subscriptions/13860ba9-4f9d-4a3b-b9e1-e5ec9e8cd3f1/resourceGroups/pdp-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/pdp-dev-pfu-vnet999", "prefixes": [ "10.115.154.0/24" ], "resource_group": "pdp-dev-pfu-rg999", "subscription_id": "13860ba9-4f9d-4a3b-b9e1-e5ec9e8cd3f1", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "mrw-dev-pfu-vnet999", "id": "/subscriptions/2a0e312e-4403-46f6-aa09-641f75756c78/resourceGroups/mrw-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/mrw-dev-pfu-vnet999", "prefixes": [ "10.115.150.0/24" ], "resource_group": "mrw-dev-pfu-rg999", "subscription_id": "2a0e312e-4403-46f6-aa09-641f75756c78", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "bbs-dev-pfu-vnet999", "id": "/subscriptions/2df000fc-cb32-4cd2-b96e-15c86c5bfcc2/resourceGroups/bbs-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/bbs-dev-pfu-vnet999", "prefixes": [ "10.115.147.0/24" ], "resource_group": "bbs-dev-pfu-rg999", "subscription_id": "2df000fc-cb32-4cd2-b96e-15c86c5bfcc2", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "dso-dev-pfu-vnet999", "id": "/subscriptions/3e537d7d-7b0b-48c4-b125-0d7af86ca8f0/resourceGroups/dso-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/dso-dev-pfu-vnet999", "prefixes": [ "10.115.164.0/22" ], "resource_group": "dso-dev-pfu-rg999", "subscription_id": "3e537d7d-7b0b-48c4-b125-0d7af86ca8f0", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "pss-dev-pfu-vnet997", "id": "/subscriptions/3f901c13-c8df-470f-9fa2-05bd8037b210/resourceGroups/pss-dev-pfu-rg997/providers/Microsoft.Network/virtualNetworks/pss-dev-pfu-vnet997", "prefixes": [ "10.115.138.0/24" ], "resource_group": "pss-dev-pfu-rg997", "subscription_id": "3f901c13-c8df-470f-9fa2-05bd8037b210", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "bdd-dev-pfu-vnet999", "id": "/subscriptions/525338e1-5455-46d3-939f-9e85d23cc4ac/resourceGroups/bdd-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/bdd-dev-pfu-vnet999", "prefixes": [ "10.115.155.0/24" ], "resource_group": "bdd-dev-pfu-rg999", "subscription_id": "525338e1-5455-46d3-939f-9e85d23cc4ac", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "con-dev-vcn-vnet002", "id": "/subscriptions/5fa9190a-9e57-4d0f-b8e3-8d596bca7ab0/resourceGroups/con-dev-vcn-rg002/providers/Microsoft.Network/virtualNetworks/con-dev-vcn-vnet002", "prefixes": [ "10.115.137.0/24" ], "resource_group": "con-dev-vcn-rg002", "subscription_id": "5fa9190a-9e57-4d0f-b8e3-8d596bca7ab0", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "mcs-dev-pfu-vnet999", "id": "/subscriptions/640873de-6dfb-489e-8791-b061208965c4/resourceGroups/mcs-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/mcs-dev-pfu-vnet999", "prefixes": [ "10.115.152.0/24" ], "resource_group": "mcs-dev-pfu-rg999", "subscription_id": "640873de-6dfb-489e-8791-b061208965c4", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "lct-dev-pfu-vnet999", "id": "/subscriptions/8f4fb826-e4c7-44da-83ab-3e3445607791/resourceGroups/lct-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/lct-dev-pfu-vnet999", "prefixes": [ "10.115.153.0/24" ], "resource_group": "lct-dev-pfu-rg999", "subscription_id": "8f4fb826-e4c7-44da-83ab-3e3445607791", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "dip-qas-pfu-vnet997", "id": "/subscriptions/9d8cd9ae-eb2d-4042-a347-3e92f9757ff7/resourceGroups/dip-qas-pfu-rg997/providers/Microsoft.Network/virtualNetworks/dip-qas-pfu-vnet997", "prefixes": [ "10.115.240.0/22" ], "resource_group": "dip-qas-pfu-rg997", "subscription_id": "9d8cd9ae-eb2d-4042-a347-3e92f9757ff7", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "dip-dev-pfu-vnet997", "id": "/subscriptions/ac659736-3222-4d73-8278-41ffb130aaa7/resourceGroups/dip-dev-pfu-rg997/providers/Microsoft.Network/virtualNetworks/dip-dev-pfu-vnet997", "prefixes": [ "10.115.151.0/24" ], "resource_group": "dip-dev-pfu-rg997", "subscription_id": "ac659736-3222-4d73-8278-41ffb130aaa7", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "ts2-dev-pfu-vnet999", "id": "/subscriptions/c1c44998-2c27-473c-939c-49fab32fc5e8/resourceGroups/ts2-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/ts2-dev-pfu-vnet999", "prefixes": [ "10.115.160.0/24" ], "resource_group": "ts2-dev-pfu-rg999", "subscription_id": "c1c44998-2c27-473c-939c-49fab32fc5e8", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "sce-dev-pfu-vnet999", "id": "/subscriptions/c9e62d43-e05a-4873-9b76-f81edf1b15a4/resourceGroups/sce-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/sce-dev-pfu-vnet999", "prefixes": [ "10.115.168.0/22" ], "resource_group": "sce-dev-pfu-rg999", "subscription_id": "c9e62d43-e05a-4873-9b76-f81edf1b15a4", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "dip-qas-pfu-vnet998", "id": "/subscriptions/d4197ff9-c433-4904-a107-1def14b9c617/resourceGroups/dip-qas-pfu-rg998/providers/Microsoft.Network/virtualNetworks/dip-qas-pfu-vnet998", "prefixes": [ "10.115.248.0/22" ], "resource_group": "dip-qas-pfu-rg998", "subscription_id": "d4197ff9-c433-4904-a107-1def14b9c617", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "grp-dev-pfu-vnet998", "id": "/subscriptions/e0969eca-aa1c-46d4-810a-815b692f6c1b/resourceGroups/grp-dev-pfu-rg998/providers/Microsoft.Network/virtualNetworks/grp-dev-pfu-vnet998", "prefixes": [ "10.115.156.0/24" ], "resource_group": "grp-dev-pfu-rg998", "subscription_id": "e0969eca-aa1c-46d4-810a-815b692f6c1b", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" }, { "name": "sdf-dev-pfu-vnet999", "id": "/subscriptions/ec8aa50e-1dc8-4be7-9aa2-eda3723b9b24/resourceGroups/sdf-dev-pfu-rg999/providers/Microsoft.Network/virtualNetworks/sdf-dev-pfu-vnet999", "prefixes": [ "10.115.146.0/24" ], "resource_group": "sdf-dev-pfu-rg999", "subscription_id": "ec8aa50e-1dc8-4be7-9aa2-eda3723b9b24", "tenant_id": "15d1bef2-0a6a-46f9-be4c-023279325e51" } ] On Fri, 30 May 2025 at 17:24, DCMattyG ***@***.***> wrote: > *DCMattyG* left a comment (Azure/ipam#350) > <#350 (comment)> > > Hey there @aazherelyeu <https://github.com/aazherelyeu>, happy to help > how I can here! > > The Azure IPAM application itself runs inside your browser and nothing > has changed from a code perspective in a while (although I am working on > 3.6 now). > > I see that you've shared the log from the Log Stream which shows that the > service was returning a 200 to the browser call, so something that would be > helpful for the next steps of troubleshooting would be to look at the error > the browser is seeing. To do this you'll want to open the Web Developer > Tools in whatever browser you're using, navigate to the "Networking" tab, > and retry the operation in Azure IPAM. That way we can see what is going on > from the browser perspective and even inspect the payload that is returned. > > image.png (view on web) > <https://github.com/user-attachments/assets/156eab41-fb5c-430c-915e-51fbfad9d0da> > > If this information is too sensitive to share on GitHub, you can always > email me at ***@***.*** Additionally, I'm happy to > schedule a working session with you to examine this personally. Just drop > me and email and we can schedule a time that is most convenient for you. > > Hope that helps! > > — > Reply to this email directly, view it on GitHub > <#350 (comment)>, or > unsubscribe > <https://github.com/notifications/unsubscribe-auth/ANUWDLIO7226XT66RXB2WXT3BBZZTAVCNFSM6AAAAAB6FOXJKWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDSMRSGY4TIMRRGA> > . > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

[dani3lh3pe]

Hi @DCMattyG & @aazherelyeu,

I'm currently running into the same problem. Running latest IPAM version in a container on an Azure App Service. I also tried version 3.4.0 and 3.5.0 but still not working.

We are running multiple regions with your tool and never had any problems until know. Funny thing is, that this is only for one region/IP-block. What I can see inside the browser DEV tools for this IP block is, that it returns the VNETs as JSON along with the response, but only 190 VNETs. Since a couple of weeks, we have 205 VNETs in this IP Block. Is it possible, that the application does not support more than 190 VNETs?

[DCMattyG]

Hi @dani3lh3pe, I've actually been working on this over the last week and have had some trouble recreating this myself so I'd love to perhaps work with you on diagnosing this a bit further.

I have some development code I'd love for you to test....if I provide you instructions, would you be able to do a bit of testing on this for me?

By the way, happy to communicate via email if that is more preferable for you!

[dani3lh3pe]

Hi @DCMattyG , hope my mail reaches you, since this is actually the first time I'm responding via mail on github. If you have not received it, please let me know.

[DCMattyG]

Hey there @dani3lh3pe, I did indeed get your message so you're good!

Are you using Azure IPAM as an Azure App Service or a Function App? That way I can walk you through testing the current development code.

[dani3lh3pe]

@DCMattyG perfect, great to know this is working! I'm currently using Azure Ipam containerized in an Azure Web App.

[aazherelyeu]

Hi, I also use Web app

…

On Fri, 31 Oct 2025 at 17:41, Daniel Hepe ***@***.***> wrote: *dani3lh3pe* left a comment (Azure/ipam#350) <#350 (comment)> @DCMattyG <https://github.com/DCMattyG> perfect, great to know this is working! I'm currently using Azure Ipam containerized in an Azure Web App. — Reply to this email directly, view it on GitHub <#350 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANUWDLLD3HFTEGZR5YK5FNL32OGLFAVCNFSM6AAAAAB6FOXJKWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTINZTHE2DKNZSGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[DCMattyG]

Ok @dani3lh3pe and @aazherelyeu, I have created a Development build of the Azure IPAM container and you can test it our by switching to the DEV repository as pictured here:

I would like to call out that it's important not to remain on the DEV images for an extended period of time as these are constantly getting updated with potentially unstable code, but for now the current images have the fixes I've tested incorporated into them and I'd love your feedback if these updates address the issue that you are currently experiencing so that I can incorporate them into Azure IPAM v3.7.0.

Looking forward to hearing about your test results!