When the client run web client because they are using windows 7. They see not secure beside http:ms-dynamics:8080/DYNAMICSNAV110, and I tried to change it https but I was receiving “the site can’t provide secure connection” with https:ms-dynamics:8080/DynamicsNAV110 after follow the link below https://suvidhablogpost.wordpress.com/2014/09/03/securing-the-nav-web-client-connection-with-ssl/
My first question was on not secure on the client side which DamJanZa gave beautiful advice on live/ production that I should purchase SSL, I generated self-certificate and my second question is I have installed NAV 2017 with client and web client installed but now I installed NAV 2018, it was only the client installed and I also installed separately web client but it does not installed.
As I am not sure on how your NAV 2017 was installed and how you did the NAV 2018 installation - Then my first guess would be that you have probably overwritten the NAV 2017 webclient installation with the NAV 2018 webclient.
You have to see if you have two folders ind C:\inetpub\wwwroot\ - if not it has been overwritten
Secondly you have to look into your config-file (web.config)
I just noticed and it’s done. I’m running two NAV Instances separately from Microsoft Dynamics NAV Administrator where DynamicsNAV110 is for the webclient and the second one for the windows, both are looking at the same database. Once I change the Credential Type : UserName for the Instance DynamicsNAV110 and run the http://localhost:8080/dynamicsnav110/, it will displayed “There is a communication protocol mismatch between the client and the server” on my Local (System), immediately I change the Credential Type : Windows it will connect.