Arduino MKR GSM 1400 SSL client example fails to connect I am using the GsmSSLWebClient example which comes with the MKRGSM library. 
The original example works just fine, I get the arduino ascii logo. But when I change the URL the arduino doesn't get any answer: 

//char server[] = "arduino.cc"; 
//char path[] = "/asciilogo.txt";
char server[] = "wepardi.fi"; 
char path[] = "/robots.txt";

Starting Arduino web client.
connecting...
connected
GET /robots.txt HTTP/1.1
Host: wepardi.fi
Connection: close


disconnecting.


From Firefox https://www.wepardi.fi/robots.txt is displayed correctly. 
I tried also some other sites, and from some of them I get the ascii file content correctly, and from some others not. 

Something wrong with my settings?

Prints from debug mode:

connecting...


...

AT+USECMNG=0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5",1239
&gt;
+USECMNG: 0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5","cb17e431673ee209fe455793f30afa1c"

OK
AT+USOCR=6

+USOCR: 0

OK
AT+USOSEC=0,1,0

OK
AT+USECPRF=0,0,1,4,"www.wepardi.fi"

OK
AT+USOCO=0,"www.wepardi.fi",443

ERROR

+UUSOCL: 0
AT+USOCL=0

ERROR
connected
GET /robots.txt HTTP/1.1
Host: www.wepardi.fi
Connection: close


disconnecting.


Command
    AT+USOCO=0,"www.wepardi.fi",443
fails

GsmWebClient (no SSL) example works fine with any hosts I have tried.
I finally found a solution to this problem. Disabling certificate validation in MKRGSM library makes the SSL connection succeed also to this site. In MKRGSM/src/GSMClient.cpp I changed 

//     MODEM.sendf("AT+USECPRF=0,0,1,4,\"%s\"", _host);
       MODEM.sendf("AT+USECPRF=0");


to use modem factory settings. I still don't know what was the problem with the certificates. 
Thanks to everyone who tried to help with this.