azurewebsites.net issue - Your connection to this site isn't secure ERR_SSL_VERSION_OR_CIPHER_MISMATCH

Question

azurewebsites.net issue - Your connection to this site isn't secure ERR_SSL_VERSION_OR_CIPHER_MISMATCH

Iain Harris 11

Some of our users can no longer access our API hosted on azurewebsites.net.

When I go to https://<our-app-service-name>.azurewebsites.net/swagger/index.html I see the Swagger-generated page, but when some other visit the same URL they receive a response that the site uses an unsupported protocol:-

Your connection to the site isn't secure
ERR_SSL_VERSION_OR_CIPHER_MISMATCH

Why is this?

Iain

Rowland Shaw 6 Reputation points

2021-09-07T07:48:30.407+00:00

Suspect the ones that work are answered from cache - I got here, as we've started seeing the same issue start "at some point" in the last 24 hours :(
BhargaviAnnadevara-MSFT 5,356 Reputation points

2021-09-07T07:56:21.61+00:00

@Iain Harris @Rowland Shaw Thanks for reaching out and reporting the issue. I've reached out to our internal teams to check on this and will let you know as I have more details. Meanwhile, could you please confirm which region your apps are deployed to? And the SKU they are on?
Rowland Shaw 6 Reputation points

2021-09-07T07:58:14.297+00:00

This might be an ISP issue, at least in my case, going by https://twitter.com/ealexhudson/status/1434921204289351683
Adam Brown 21 Reputation points

2021-09-07T08:29:21.507+00:00

Can confirm that all .azurewebsites.net https requests are failing across the board.
Adam Brown 21 Reputation points

2021-09-07T08:31:25.2+00:00

Hi.

I'm having this issue in the UK - all https requests made to any *.azurewebsites.net domain from multiple platforms failing with ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Adam Brown 21 Reputation points

2021-09-07T09:31:47.693+00:00

Issue now fixed.
Adam Brown 21 Reputation points

2021-09-07T09:31:54.553+00:00

Issue now fixed
BhargaviAnnadevara-MSFT 5,356 Reputation points

2021-09-07T09:49:56.457+00:00

@Iain Harris @Rowland Shaw The issue seems to be resolved for some customers now. Could you please recheck if you are able to access your apps again as usual?

Rowland Shaw 6 Reputation points

2021-09-07T07:48:30.407+00:00

Suspect the ones that work are answered from cache - I got here, as we've started seeing the same issue start "at some point" in the last 24 hours :(
BhargaviAnnadevara-MSFT 5,356 Reputation points

2021-09-07T07:56:21.61+00:00

@Iain Harris @Rowland Shaw Thanks for reaching out and reporting the issue. I've reached out to our internal teams to check on this and will let you know as I have more details. Meanwhile, could you please confirm which region your apps are deployed to? And the SKU they are on?
Rowland Shaw 6 Reputation points

2021-09-07T07:58:14.297+00:00

This might be an ISP issue, at least in my case, going by https://twitter.com/ealexhudson/status/1434921204289351683
Adam Brown 21 Reputation points

2021-09-07T08:29:21.507+00:00

Can confirm that all .azurewebsites.net https requests are failing across the board.
Adam Brown 21 Reputation points

2021-09-07T08:31:25.2+00:00

Hi.

I'm having this issue in the UK - all https requests made to any *.azurewebsites.net domain from multiple platforms failing with ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Adam Brown 21 Reputation points

2021-09-07T09:31:47.693+00:00

Issue now fixed.
Adam Brown 21 Reputation points

2021-09-07T09:31:54.553+00:00

Issue now fixed
BhargaviAnnadevara-MSFT 5,356 Reputation points

2021-09-07T09:49:56.457+00:00

@Iain Harris @Rowland Shaw The issue seems to be resolved for some customers now. Could you please recheck if you are able to access your apps again as usual?

Answer 1

Summarizing the discussion as an answer below so it benefits others in the community seeing similar issues.

@Iain Harris @Rowland Shaw We had gotten similar reports from other customers today about this error. It appears that this was caused due to an ISP issue in the region, and is now resolved. More details here: https://twitter.com/ealexhudson/status/1434921204289351683

Please check if you are able to access your apps again as usual.

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azurewebsites.net issue - Your connection to this site isn't secure ERR_SSL_VERSION_OR_CIPHER_MISMATCH

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