diff --git a/src/cisco_lib/PolicyCompiler_pix.cpp b/src/cisco_lib/PolicyCompiler_pix.cpp
index 6a8f4aa3b..fb1df1067 100644
--- a/src/cisco_lib/PolicyCompiler_pix.cpp
+++ b/src/cisco_lib/PolicyCompiler_pix.cpp
@@ -782,7 +782,7 @@ string PolicyCompiler_pix::printPreambleCommands()
 
         try
         {
-            InetAddr(addr);
+            (void) InetAddr(addr);
         } catch(FWException &ex)
         {
             abort("Invalid address for management subnet: '"+addr+"'");
diff --git a/src/fwbedit/fwbedit.cpp b/src/fwbedit/fwbedit.cpp
index 34c4f9270..b51047e48 100644
--- a/src/fwbedit/fwbedit.cpp
+++ b/src/fwbedit/fwbedit.cpp
@@ -888,7 +888,7 @@ int main(int argc, char * const *argv)
     } catch (std::string s) {
         cerr << s;
         exit(1);
-    } catch (std::exception ex) {
+    } catch (std::exception &ex) {
         cerr << ex.what();
         exit(1);
     } catch (...) {
diff --git a/src/iosacl/iosacl.cpp b/src/iosacl/iosacl.cpp
index ee8e72248..46eb9ec88 100644
--- a/src/iosacl/iosacl.cpp
+++ b/src/iosacl/iosacl.cpp
@@ -179,7 +179,7 @@ int main(int argc, char **argv)
     {
         cerr << s << endl;
         return 1;
-    } catch (std::exception ex)
+    } catch (std::exception &ex)
     {
         cerr << "exception: " << ex.what() << endl;
         return 1;
diff --git a/src/iptlib/AutomaticRules_ipt.cpp b/src/iptlib/AutomaticRules_ipt.cpp
index 809fae54e..779aa5705 100644
--- a/src/iptlib/AutomaticRules_ipt.cpp
+++ b/src/iptlib/AutomaticRules_ipt.cpp
@@ -104,7 +104,7 @@ void AutomaticRules_ipt::addConntrackRule()
 
     try
     {
-        InetAddr(addr);
+        (void) InetAddr(addr);
     } catch (FWException &ex)
     {
         try
diff --git a/src/junosacl/junosacl.cpp b/src/junosacl/junosacl.cpp
index b3ed7fa66..9460a189a 100644
--- a/src/junosacl/junosacl.cpp
+++ b/src/junosacl/junosacl.cpp
@@ -179,7 +179,7 @@ int main(int argc, char **argv)
     {
         cerr << s << endl;
         return 1;
-    } catch (std::exception ex)
+    } catch (std::exception &ex)
     {
         cerr << "exception: " << ex.what() << endl;
         return 1;
diff --git a/src/libfwbuilder/src/fwcompiler/PolicyCompiler.cpp b/src/libfwbuilder/src/fwcompiler/PolicyCompiler.cpp
index ae6ffc35c..b57ea4eb2 100644
--- a/src/libfwbuilder/src/fwcompiler/PolicyCompiler.cpp
+++ b/src/libfwbuilder/src/fwcompiler/PolicyCompiler.cpp
@@ -567,7 +567,7 @@ PolicyCompiler::find_more_specific_rule(
 		    return j;
 		}
 
-	    } catch (FWException ex) {
+	    } catch (FWException &ex) {
 		cerr << " *** Exception: " << ex.toString() << endl;
 	    }  
 	}
diff --git a/src/libgui/ObjectTreeView.cpp b/src/libgui/ObjectTreeView.cpp
index 1c845da55..648b398f4 100644
--- a/src/libgui/ObjectTreeView.cpp
+++ b/src/libgui/ObjectTreeView.cpp
@@ -957,13 +957,13 @@ static bool filterMatchesIpAddress(const QStringList &args,
             InetAddr ipv4addr(rx.cap(1).toStdString());
             InetAddr ipv4mask(netmask);
             searchAddrAndMask = InetAddrMask(ipv4addr, ipv4mask);
-        } catch (const FWException) { // Could not create IPv4 object. Trying IPv6.
+        } catch (const FWException &) { // Could not create IPv4 object. Trying IPv6.
             try {
                 int netmask = rx.cap(2).isEmpty() ? 128 : rx.cap(2).toInt();
                 InetAddr ipv6addr(AF_INET6, rx.cap(1).toStdString());
                 InetAddr ipv6mask(AF_INET6, netmask);
                 searchAddrAndMask = InetAddrMask(ipv6addr, ipv6mask);
-            } catch (const FWException) { // Could not create IPv6 object.
+            } catch (const FWException &) { // Could not create IPv6 object.
                 // User did not submit a valid IP address
                 return false;
             }
diff --git a/src/nxosacl/nxosacl.cpp b/src/nxosacl/nxosacl.cpp
index be1cfd1dd..67bb1b301 100644
--- a/src/nxosacl/nxosacl.cpp
+++ b/src/nxosacl/nxosacl.cpp
@@ -179,7 +179,7 @@ int main(int argc, char **argv)
     {
         cerr << s << endl;
         return 1;
-    } catch (std::exception ex)
+    } catch (std::exception &ex)
     {
         cerr << "exception: " << ex.what() << endl;
         return 1;
diff --git a/src/procurve_acl/procurve_acl.cpp b/src/procurve_acl/procurve_acl.cpp
index 31a536e4d..2a5b933ad 100644
--- a/src/procurve_acl/procurve_acl.cpp
+++ b/src/procurve_acl/procurve_acl.cpp
@@ -179,7 +179,7 @@ int main(int argc, char **argv)
     {
         cerr << s << endl;
         return 1;
-    } catch (std::exception ex)
+    } catch (std::exception &ex)
     {
         cerr << "exception: " << ex.what() << endl;
         return 1;