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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(25.6, 63%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGK%3C/text%3E%3C/svg%3E)
i just upgrade my xamarin project to maui and i have an httpclient error Unable to parse TLS packet header when i try to comunicate with my api
HttpClient httpClient = new HttpClient();
response = await httpClient.SendAsync(msg, cts.Token);
sendasync throws Unable to parse TLS packet header
I tried to fix it from androidmanifest with android:usesCleartextTraffic="true" and network_security_config and didnt help
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 40%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYL%3C/text%3E%3C/svg%3E)
For further investigation, could you please provide the following information?
Your prompt reply will be highly appreciated.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(54.400000000000006, 21%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERA%3C/text%3E%3C/svg%3E)
I have the same issue. I'm debugging, with Net MAUI, an Android APP which has a webview inside that loads a ASP.NET APP. Also, before showing this ASP.NET Webpage, I have an sign in form (built inside NET MAUI) that, when credentials are written, this sends the username and password to this ASP.NET webpage to validate. When using the production APP, works like a charm, but when debugging the ASP.NET webpage, I get the same error. I've done countless things to fix all the issues that I've encountered that lead me to this very same error message.
Thanks beforehand!
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
with android (unlike windows) code can not override ssl verification. also http is not supported by default for api calls. see:
https://developer.android.com/privacy-and-security/security-config#TrustingAdditionalCas
note: you can also install and trust the self signed certificate on the device. google for examples