diff --git a/code/ryzom/client/src/http_client_curl.cpp b/code/ryzom/client/src/http_client_curl.cpp
index ecbfd065b..0c433a598 100644
--- a/code/ryzom/client/src/http_client_curl.cpp
+++ b/code/ryzom/client/src/http_client_curl.cpp
@@ -61,21 +61,31 @@ bool CCurlHttpClient::authenticate(const std::string &user, const std::string &p
 
 const char *CAFilename = "ssl_ca_cert.pem"; // this is the certificate "Thawte Server CA"
 
+// ***************************************************************************
 static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
 {
+	// look for certificate in search paths
 	string path = CPath::lookup(CAFilename);
 	nldebug("Cert path '%s'", path.c_str());
 
+	if (path.empty())
+	{
+		nlwarning("Unable to find %s", CAFilename);
+		return CURLE_SSL_CACERT;
+	}
+
 	CIFile file;
 
-	if (!file.open(CAFilename))
+	// open certificate
+	if (!file.open(path))
 	{
-		nlwarning("Unable to open %s", CAFilename);
+		nlwarning("Unable to open %s", path.c_str());
 		return CURLE_SSL_CACERT;
 	}
 
 	CURLcode res = CURLE_OK;
 
+	// load certificate content into memory
 	std::vector<uint8> buffer(file.getFileSize());
 	file.serialBuffer(&buffer[0], file.getFileSize());
 
@@ -84,25 +94,33 @@ static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
 
 	if (bio)
 	{
+		// get a pointer to the X509 certificate store (which may be empty!)
+		X509_STORE *store = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
+
 		// use it to read the PEM formatted certificate from memory into an X509
 		// structure that SSL can use
-		X509 *cert = NULL;
-		PEM_read_bio_X509(bio, &cert, 0, NULL);
+		STACK_OF(X509_INFO) *info = PEM_X509_INFO_read_bio(bio, NULL, NULL, NULL);
 
-		if (cert)
+		if (info)
 		{
-			// get a pointer to the X509 certificate store (which may be empty!)
-			X509_STORE *store = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
-
-			// add our certificate to this store
-			if (X509_STORE_add_cert(store, cert) == 0)
+			// iterate over all entries from the PEM file, add them to the x509_store one by one
+			for (sint i = 0; i < sk_X509_INFO_num(info); ++i)
 			{
-				nlwarning("Error adding certificate");
-				res = CURLE_SSL_CACERT;
+				X509_INFO *itmp = sk_X509_INFO_value(info, i);
+
+				if (itmp->x509)
+				{
+					// add our certificate to this store
+					if (X509_STORE_add_cert(store, itmp->x509) == 0)
+					{
+						nlwarning("Error adding certificate");
+						res = CURLE_SSL_CACERT;
+					}
+				}
 			}
 
-			// decrease reference counts
-			X509_free(cert);
+			// cleanup
+			sk_X509_INFO_pop_free(info, X509_INFO_free);
 		}
 		else
 		{
@@ -113,9 +131,14 @@ static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
 		// decrease reference counts
 		BIO_free(bio);
 	}
+	else
+	{
+		nlwarning("Unable to allocate BIO buffer for certificates");
+		res = CURLE_SSL_CACERT;
+	}
 
 	// all set to go
-	return CURLE_OK ;
+	return res;
 }
 
 // ***************************************************************************
@@ -125,7 +148,10 @@ bool CCurlHttpClient::verifyServer(bool verify)
 	curl_easy_setopt(_Curl, CURLOPT_SSL_VERIFYPEER, verify ? 1 : 0);
 	curl_easy_setopt(_Curl, CURLOPT_SSLCERTTYPE, "PEM");
 	// would allow to provide the CA in memory instead of using CURLOPT_CAINFO, but needs to include and link OpenSSL
-	curl_easy_setopt(_Curl, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
+	if (curl_easy_setopt(_Curl, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function) == CURLE_NOT_BUILT_IN)
+	{
+		nlwarning("Unable to support CURLOPT_SSL_CTX_FUNCTION, curl not compiled with OpenSSL ?");
+	}
 	// don't use that anymore, because CA can't be loaded from BNP and doesn't support UTF-8 under Windows
 	// curl_easy_setopt(_Curl, CURLOPT_CAINFO, path.c_str());
 	curl_easy_setopt(_Curl, CURLOPT_CAPATH, NULL);
@@ -181,7 +207,7 @@ bool CCurlHttpClient::sendRequest(const std::string& methodWB, const std::string
 	curl_easy_getinfo(_Curl, CURLINFO_RESPONSE_CODE, &r);
 	if (verbose)
 	{
-		nldebug("%u", r);
+		nldebug("%u", (uint)r);
 	}
 
 	return true;