Question Site not working with some user agent

[pwfllw]

My site is not working for some mobile browser and I don't know what is wrong. When I check logs (under websites and domain option) nothing shows up there. When I try to open my site with some mobile device, nothing comes in logs, and site is also not opening in that device with that device's default browser. If I install chrome or any other browser in that same device then the site is working.

I am using Nginx only configuration. When switch to Apache only configuration the site is working again with default browser of that mobile. When I use Apache + Nginx then the site is also not working with default browser of that mobile device.

The problem is that there is mobile brand called Oppo & Vivo, My site is not working with their default browser (but working with chrome) in that same device. In other mobile devices my site is working with default browser as well as chrome browser.

I am also using let's encrypt.

I tried lot but unable to solve that issue. I don't know what is issue, please help me to solve it.

 

[Frostbolt]

My guess would be problems with https. Older/rarer browsers sometimes use deprecated security protocols and the default plesk security configuration is quite narrow (as in, it doesn't allow much). Debugging the issue is hard, because usually you can't see the lower-level errors on the mobile browser.

I don't really have a solution, but have you tried turning https off to see if that is the cause of the issue?

 

[Pentarou]

Hi pwfllw,

Not exactly sure what's going on, but:

• Have you tried clearing your browser and other caches?
• If you recently changed DNS setting, it can can take up to 24 hours.

Take care.

 

[pwfllw]

My guess would be problems with https. Older/rarer browsers sometimes use deprecated security protocols and the default plesk security configuration is quite narrow (as in, it doesn't allow much). Debugging the issue is hard, because usually you can't see the lower-level errors on the mobile browser.

I don't really have a solution, but have you tried turning https off to see if that is the cause of the issue?

Thanks for reply buddy, If I turn off ssl support then the site is working on that device. Also if I don't select the ssl certificate then also the site is opening in that device. I am using Lets Encrypt's ssl certificate. I am clueless why it is not working on that devices and working on other mobile browsers.

Hi pwfllw,

Not exactly sure what's going on, but:

• Have you tried clearing your browser and other caches?
• If you recently changed DNS setting, it can can take up to 24 hours.

Take care.

Yes I tried, but nothing worked.

 

[Brujo]

did you have modified any cipher or ssl settings on your server?
please post the result of:
cat /etc/nginx/conf.d/ssl.conf & plesk version

also Qualys is a good help

 

[pwfllw]

did you have modified any cipher or ssl settings on your server?
please post the result of:
cat /etc/nginx/conf.d/ssl.conf & plesk version

also Qualys is a good help

No didn't modified manually. I just installed lets encrypt by using its extension which is available in plesk.

ssl.conf :

ssl_ciphers HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

Plesk version : Plesk Onyx 17.5.3 Update #44

 

[Bonsai78]

I could bet, if you enter your site in ssllabs.com you get a response that SNI fails .... what causes problems with some browsers and services like PayPal.

The problem seems to be here:


Why there's no possibility to select any other certificate or set it to none?