[monitoring-plugins] change error message for missing certificate

[Andre Klärner]

 Module: monitoring-plugins
 Branch: master
 Commit: ef3045b97eea23a4dec3197277e5ff4e5afc5c71
 Author: Andre Klärner <kandre at ak-online.be>
   Date: Mon Mar 17 16:13:46 2025 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=ef3045b9

change error message for missing certificate

The old error message is quite similar to the openssl `failed to retrieve issuer certificate` and can mislead users to troubleshooting certificate stores.

The new message should be distinct enough to make it clear to users that this is not a problem raised by the underlying SSL implementation, but a problem inside monitoring-plugins.

---

 plugins/sslutils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 719de575..96740b3a 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -201,7 +201,7 @@ int np_net_ssl_check_certificate(X509 *certificate, int days_till_exp_warn, int
 	time_t tm_t;
 
 	if (!certificate) {
-		printf("%s\n", _("CRITICAL - Cannot retrieve server certificate."));
+		printf("%s\n", _("CRITICAL - No server certificate present to inspect."));
 		return STATE_CRITICAL;
 	}