diff --git a/PAM/ssh/include/rublon/configuration.hpp b/PAM/ssh/include/rublon/configuration.hpp
index 0c304f3..a6aee8b 100644
--- a/PAM/ssh/include/rublon/configuration.hpp
+++ b/PAM/ssh/include/rublon/configuration.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <algorithm>
 #include <rublon/error.hpp>
 #include <rublon/memory.hpp>
 #include <rublon/static_string.hpp>
@@ -86,6 +87,7 @@ class ConfigurationReader {
             if(it == keyValues.end()) {
                 return std::nullopt;
             }
+            
             return string{it->second.data(), it->second.size(), memoryResource};
         };
 
@@ -198,6 +200,12 @@ class ConfigurationReader {
             return true;
         };
 
+        auto toLowerCaseOpt = [](auto str) {
+            if(str)
+                std::transform(str->cbegin(), str->cend(), str->begin(), [](auto c) { return std::tolower(c); });
+            return str;
+        };
+
         /// NOTE:
         // getStringOpt can return a valid empty string, for example configuration entry like
         //  option=
@@ -238,8 +246,8 @@ class ConfigurationReader {
 
         // reading proxy configuration
         config.proxyEnabled = getBool("proxyEnabled").value_or(false);
-        config.proxyType    = getStringOpt("proxyType");
-        config.proxyHost    = getStringOpt("proxyHost");
+        config.proxyType    = toLowerCaseOpt(getStringOpt("proxyType"));
+        config.proxyHost    = toLowerCaseOpt(getStringOpt("proxyHost"));
 
         // Apply fallback if no config is set
         if(config.proxyEnabled && (!config.proxyType || config.proxyType->empty()) && (!config.proxyHost || config.proxyHost->empty())) {