diff --git a/world/net/entity.c b/world/net/entity.c
index 06c0db7..682abf5 100644
--- a/world/net/entity.c
+++ b/world/net/entity.c
@@ -426,7 +426,7 @@ msg(source, mc, data, vars) {
 		// and have it replaced by object.. but that's not the case
 		// we _could_ however do that by using _uniform_trustee
 		// and doing is_localhost on all _uniform's at parsing time
-		if (is_localhost(u[UHost])) trustee_nick = u[UNick];
+		if (is_localhost(lower_case(u[UHost]))) trustee_nick = u[UNick];
 	    }
 	    if (get_trust(trustee_nick, 0) < MINIMUM_TRUST) return 1;
 	    // entweder trustee ist ein local nick, dann kriegen wir den
diff --git a/world/net/library.i b/world/net/library.i
index a893b3a..34ac854 100644
--- a/world/net/library.i
+++ b/world/net/library.i
@@ -658,7 +658,7 @@ int xmpp_sendmsg(mixed target, string mc, mixed data, mapping vars,
 	if (o = targets[tmp]) {
 	    P2(("%O to be delivered on %O\n",
 		otarget, o ))
-	} else if (is_localhost(u[UHost])) {
+	} else if (is_localhost(lower_case(u[UHost]))) {
 	    unless (u[UUser]) {
 		P0(("Intercepted %O to %O from %O\n", mc, target, source))
 		// 0 makes sendmsg try to relay via xmpp.scheme.psyced.org
diff --git a/world/net/person.c b/world/net/person.c
index 4d46681..f3912e6 100644
--- a/world/net/person.c
+++ b/world/net/person.c
@@ -2525,7 +2525,7 @@ logon(host) {
 		    && mode[PPL_NOTIFY] >= PPL_NOTIFY_FRIEND) continue;
 	    if (u = parse_uniform(ni)) {
 		// <lynX> first we change the ppl, then we need this code
-//		if (is_localhost(u[UHost])) {
+//		if (is_localhost(lower_case(u[UHost]))) {
 //		    o = summon_person(u[UNick]);
 //		    insert_member(o);
 //		} else {
diff --git a/world/net/psyc/library.i b/world/net/psyc/library.i
index fcbc955..46f551c 100644
--- a/world/net/psyc/library.i
+++ b/world/net/psyc/library.i
@@ -411,6 +411,7 @@ int psyc_sendmsg(mixed target, string mc, mixed data, mapping vars,
 	unless (buf) return 0;
 #endif /* NEW_RENDER */
 
+	// host seems to already be in lower_case
 	if (is_localhost(host)) return send_udp(host, port, buf);
 	PT(("dns_resolve + send_udp %O:%O packet:\n%s", host,port,buf))
 	dns_resolve(host, (: if (stringp($1))
diff --git a/world/net/psyc/parse.i b/world/net/psyc/parse.i
index 7f149be..0da0396 100644
--- a/world/net/psyc/parse.i
+++ b/world/net/psyc/parse.i
@@ -983,8 +983,8 @@ protected int deliver(mixed ip, string host, string mc, string buffer, mapping c
 			    cvars["_INTERNAL_nick_target"] = u[UNick];
 #endif
 			P3(("DEBUG: is_localhost is %O for %O of %O\n",
-			    is_localhost(u[UHost]), u[UHost], u))
-			unless (is_localhost(u[UHost])) {
+			    is_localhost(lower_case(u[UHost])), u[UHost], u))
+			unless (is_localhost(lower_case(u[UHost]))) {
                             if (trustworthy > 7) {
                                 P1(("RELAYING permitted for %O to %O (%O)\n",
                                     source, t, ME))
diff --git a/world/net/sip/udp.c b/world/net/sip/udp.c
index d53d044..75c3384 100644
--- a/world/net/sip/udp.c
+++ b/world/net/sip/udp.c
@@ -107,7 +107,7 @@ parseUDP(ip, port, msg) {
 		send_udp(ip, port, reply);
 		return;
 	}
-	islocaltarget = is_localhost(tu[UHost]);
+	islocaltarget = is_localhost(lower_case(tu[UHost]));
 	// TODO this may be either local or remote users
 	if (islocaltarget && tu[UUser]) target = find_person(tu[UUser]); 
 	// TODO works only for online users
@@ -156,7 +156,7 @@ parseUDP(ip, port, msg) {
 		su = parse_uniform(source);
 		source = 0;
 #if 0
-		if (is_localhost(su[UHost])) {
+		if (is_localhost(lower_case(su[UHost]))) {
 			object o;
 			o = find_person(su[UUser]);
 			// TODO: check that source is coming from
diff --git a/world/net/spyc/circuit.c b/world/net/spyc/circuit.c
index 4c0383c..3eaff45 100644
--- a/world/net/spyc/circuit.c
+++ b/world/net/spyc/circuit.c
@@ -235,7 +235,7 @@ void circuit_msg(string mc, mapping vars, string data) {
 	if (tls_query_connection_state(ME) == 0) {
 	    array(string) targethosts = ({ });
 	    foreach(string ho : vars["_list_targets_hosts"]) {
-		if (is_localhost(ho)) {
+		if (is_localhost(lower_case(ho))) {
 		    targethosts += ({ ho });
 		}
 	    }
diff --git a/world/net/spyc/dispatch.i b/world/net/spyc/dispatch.i
index b36737b..5749612 100644
--- a/world/net/spyc/dispatch.i
+++ b/world/net/spyc/dispatch.i
@@ -49,7 +49,7 @@ void dispatch(mixed header_vars, mixed varops, mixed method, mixed body) {
             DISPATCHERROR("target is not an uniform\n")
         }
 	// FIXME relaying support here?
-        if (!is_localhost(u[UHost])) {
+        if (!is_localhost(local_host(u[UHost]))) {
             DISPATCHERROR("target is not configured on this server\n")
 	}
     }