SSLHandshakeException during Web Request

I was working on the game and as per game requirements, I was fetching logos from the web server through Web Request. Here is my code:

 // fetching all company related details
 IEnumerator LoadCompanyDetails ()
 {
 
     WWW www = new WWW (GameConstants.API_GET_LOGOS);
     yield return www;
 
     if (www.error == null) {
 
         //          Debug.Log ("Data: " + www.text);
         JSONObject jsonObj = new JSONObject (www.text);
         Debug.Log ("Loaded following XML " + www.text);
 
         long status = jsonObj [TAG_STATUS].i;
         if (status == 1) {
             // login success
             List<JSONObject> dataObj = jsonObj [TAG_DATA].list;
 
             for (int i = 0; i < dataObj.Count; i++) {
                 Company companyItem = new Company ();
                 JSONObject companyObj = dataObj [i];
 
                 companyItem.CompanyId = companyObj [TAG_COMPANY_ID].i.ToString ();
                 companyItem.CompanyName = companyObj [TAG_COMPANY_NAME].str;
                 companyItem.CompanyLogoUrl = companyObj [TAG_COMPANY_LOGO].str;
                 companyItem.AbountCompany = companyObj [TAG_COMPANY_ABOUT].str;
                 companyItem.ContactInfo = companyObj [TAG_COMPANY_CONTACT_INFO].str;
                 companyItem.CompanyEmail = companyObj [TAG_COMPANY_EMAIL].str;
                 companyItem.CompanyWebsite = companyObj [TAG_COMPANY_WEBSITE].str;
 
                 DataCollection.companyDetailsList.Add (companyItem);
             }
 
             StartCoroutine (FetchCompanyLogos ());
 
         } else {
             // login fail
         }
 
     } else {
         Debug.Log ("++++++++++++++++++++++++++++++");
         Debug.Log ("Error: " + www.error);
     }
 }

Last 3 months this working properly but suddenly SSLHandshakeException started to come.

On PC its running properly, request get satisfied. On mobile device, its not working now. Give me some suggestion for solution in this.