# Problem to logon on Android devices

**URL:** <https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177>\
**Category:** Mobile Apps\
**Tags:** android\
**Created:** [March 23, 2020, 12:09pm UTC](https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177 "2020-03-23T12:09:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![itasp](https://avatars.discourse-cdn.com/v4/letter/i/b9bd4f/32.png) [@itasp](https://forums.rocket.chat/u/itasp)\
**Post date:** [March 23, 2020, 12:09pm UTC](https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177/1 "2020-03-23T12:09:51Z")

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Hi all, it’s my first post.  
So, i have problem with android app.  
when I try to log in to the server I receive a message like in the picture (Invalid URL or unable to establish a secure connection…), iOS works normally, there is no problem on computers apps and by the web, file transfer works.  
It is possible to connect after removing the port :3000, pressing Connect, after request with a fault, adding the port :3000 again allows you to log in. The problem occour again after killing the application task in android system.  
 ![image](https://us1.discourse-cdn.com/flex021/uploads/rocketchat/original/2X/a/a25db81a9ffb4adb1796ac50bb5322db9d383c1c.png)

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**Author:** ![itasp](https://avatars.discourse-cdn.com/v4/letter/i/b9bd4f/32.png) [@itasp](https://forums.rocket.chat/u/itasp)\
**Post date:** [March 24, 2020, 11:29pm UTC](https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177/2 "2020-03-24T23:29:14Z")

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found solution in here

> [@Cannot login into Android Rocket.Chat App](https://forums.rocket.chat/t/cannot-login-into-android-rocket-chat-app/5261/8):
>
> I´ve got the same issue than you. I got to solve it adding the intermediate certificate in the /etc/nginx/certificate.crt file (refering the nginx session in the official how to [https://rocket.chat/docs/installation/manual-installation/configuring-ssl-reverse-proxy/](https://rocket.chat/docs/installation/manual-installation/configuring-ssl-reverse-proxy/) ) Copy and paste it after the certificate data of the certificate file. The apache approach works because it adds the intermediate certificate in the procedure.

just join certificate with intermediate cert to one file…

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**Author:** ![snoopytfr](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@snoopytfr](https://forums.rocket.chat/u/snoopytfr)\
**Post date:** [March 27, 2020, 3:54pm UTC](https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177/3 "2020-03-27T15:54:09Z")

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Hi Itasp,

Can you explain a little better ?  
what is the intermediate cert ?

My server is auto signed

Thank you

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**Author:** ![itasp](https://avatars.discourse-cdn.com/v4/letter/i/b9bd4f/32.png) [@itasp](https://forums.rocket.chat/u/itasp)\
**Post date:** [March 27, 2020, 7:23pm UTC](https://forums.rocket.chat/t/problem-to-logon-on-android-devices/6177/4 "2020-03-27T19:23:42Z")

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You have to copy the contents of the intermediate certificate file and paste it into the file below the contents of the root certificate. (merge their key content)  
about certificates here [https://support.ssl.com/Knowledgebase/Article/View/11/0/what-is-an-intermediate-certificate](https://support.ssl.com/Knowledgebase/Article/View/11/0/what-is-an-intermediate-certificate)