not able to telnet to port 443 on Azure storage blob

Question

not able to telnet to port 443 on Azure storage blob

MS Techie 2,751

From my onprem Windows 2019 server, i was earlier able to telnet to port 443 on the azure storage blob. We have hub and spoke network connectivity between azure and onprem via az express route.

We have private endpoint for the azure storage blob and we were abel to telnet from onprem server to azure blob storage private IP over port 443.

if i am able to telnet over port 443 to blob IP , then it means i am able to access the blob endpoint.

it was working fine yesterday. Nothing is changed in azure , nor in onprem

But i am not able to telnet to port 443 on azure storage blob.

How do i check the network connectivity between azure storage blob and onprem server?

Sumarigo-MSFT 47,471 Reputation points Microsoft Employee Moderator

2023-03-06T15:42:33.5533333+00:00

@MS Techie Just checking in to see if the below answer helped. If this answers your query, do click "Accept the answer”, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

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Sumarigo-MSFT 47,471 Reputation points Microsoft Employee Moderator

2023-03-06T15:42:33.5533333+00:00

@MS Techie Just checking in to see if the below answer helped. If this answers your query, do click "Accept the answer”, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Answer 1

JimmySalian-2011 42,526

Hi,

How is it connected is it via Expressroute or via Internet? Check local policies on Onpremise firewall whether you are allowed and also for Blob Storage if any changes on the networking to accept connections is from Enabled from selected virtual networks and IP addresses or Disabled?

https://learn.microsoft.com/en-us/azure/storage/common/storage-network-security?tabs=azure-portal

Hope this helps.

JS

==

Please Accept the answer if the information helped you. This will help us and others in the community as well.

MS Techie 2,751 Reputation points

2023-02-09T16:00:51.16+00:00

its connected via Az Express Route.

So basically , is there any azure tool that i can use to troubleshoot network connectivity between Azure blob storage and on-prem Server
MS Techie 2,751 Reputation points

2023-02-09T16:03:06.2066667+00:00
As i mentioned earlier , it is connected via Express Route.

Also as i mentioned earlier, it worked earlier and it stopped working for around 2 hours and now again it is working... But how do i get an alert when connectivity stops ?

How to troubleshooting network connectivity from onprem machine to azure storage blob ?

Can we use azure network watcher to troubleshoot the connectivity to azure blob storage ? Is Network watcher used to troubleshoot connectivity between azure IaaS resources source and destination IaaS resource ?
SaiKishor-MSFT 17,336 Reputation points

2023-02-10T21:26:11.88+00:00
@MS Techie

What is the error that you are getting when trying to reach the storage blob?

Can you confirm that your Express Route is up and running?

If using the Blob endpoint name, can you confirm BLOB URL is being converted to the private IP and is taking the private endpoint as expected?

You can use a network tools such as Fiddler, Microsoft Network Monitor or Wireshark to capture between client and server to look into the data exchanged and the determine the cause for the error.

Fiddler- https://www.telerik.com/fiddler

Azure Netmon- https://learn.microsoft.com/en-us/azure/network-watcher/network-insights-overview#connectivity

Wireshark- https://www.wireshark.org/download.html

Hope this helps. Please let me know further details so we can determine what may be causing the problem. Thank you!
SaiKishor-MSFT 17,336 Reputation points

2023-02-15T00:20:47.43+00:00

@MS Techie Any update?

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not able to telnet to port 443 on Azure storage blob

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