Certificate issue: the remote computer cannot be authenticated due to problems with its security certificate. " Error code - 0x80072f8f, 0x20

Hello Team,

I have the below issue:

Here is my RDS environment:

I have only one server 2012 R2 standard with the below roles installed 

• RD connection broker,
• RDSH,
• RD Licensing and
• RD web access

I have published few remote apps and I was able to access them using RD web feed till yesterday. 

Example :https://contoso.com/RDWeb/Feed/webfeed.aspx

I do have installed the SSL certificate on my server and provided the same to RD web. 

But today while I use the same url to access the remote apps I get the below error message 

"The remote computer cannot be authenticated due to problems with its security certificate. security certificate problems might indicate an attempt to fool you or intercept any data you send to the remote computer"

Error code - 0x80072f8f,0x20

Now I can only access the remote apps through RD web access ( https://FQDN/RDWeb)

Please help me in fixing this issue. 

Any help would be much appreciated.

Thanks

SM