# Mitmweb.exe works fine, but mitmdump.exe doesn't

**URL:** https://discourse.mitmproxy.org/t/mitmweb-exe-works-fine-but-mitmdump-exe-doesnt/1662
**Category:** help
**Created:** [September 2, 2019, 1:34pm UTC](https://discourse.mitmproxy.org/t/mitmweb-exe-works-fine-but-mitmdump-exe-doesnt/1662 "2019-09-02T13:34:47Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Nepey](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mitmproxy.org/nepey/32/467_2.png) [@Nepey](https://discourse.mitmproxy.org/u/Nepey)
#### Post date: [September 2, 2019, 1:34pm UTC](https://discourse.mitmproxy.org/t/mitmweb-exe-works-fine-but-mitmdump-exe-doesnt/1662/1 "2019-09-02T13:34:47Z")

</div>

Hello,

I starts mitmweb or mitmdump on windows 10 and see all https requests from android emulator. but mitmweb works very well, mitmdump does not.

I tryed different combinations of options.

mitmdump -s test.py  
mitmdump  
mitmdump -s test.py --cert \*=my\_cert.pem

I see the same result: output with many erros of TLS

192.168.1.54:58823: CONNECT [www.google.com:443](http://www.google.com:443)  
\<\< Cannot establish TLS with [www.google.com:443](http://www.google.com:443) (sni: None): TlsException(‘Cannot validate certificate hostname without SNI’,)

And my android application crashes too, but works fine then mitmweb.exe is started and all output lines of https requests seem as ok.