Cygwin systems seem to have a different error message when trying to connect to port 0. Let's try port 20 instead.

Author: Michael Meskes

src/interfaces/ecpg/test/connect/test1.pgc.in

@@ -63,7 +63,7 @@ exec sql end declare section;
 	exec sql disconnect;
 
 	/* wrong port */
-	exec sql connect to tcp:postgresql://localhost:0/connectdb user connectuser identified by connectpw;
+	exec sql connect to tcp:postgresql://localhost:20/connectdb user connectuser identified by connectpw;
 	/* no disconnect necessary */
 
 	/* wrong password */

src/interfaces/ecpg/test/expected/connect-test1.c

@@ -137,7 +137,7 @@ main(void)
 
 
 	/* wrong port */
-	{ ECPGconnect(__LINE__, 0, "tcp:postgresql://localhost:0/connectdb" , "connectuser" , "connectpw" , NULL, 0); }
+	{ ECPGconnect(__LINE__, 0, "tcp:postgresql://localhost:20/connectdb" , "connectuser" , "connectpw" , NULL, 0); }
 #line 66 "test1.pgc"
 
 	/* no disconnect necessary */

src/interfaces/ecpg/test/expected/connect-test1.stderr

@@ -67,12 +67,12 @@ THE PORT NUMBER MIGHT HAVE BEEN CHANGED BY THE REGRESSION SCRIPT
 [NO_PID]: sqlca: code: -402, state: 08001
 [NO_PID]: raising sqlcode -220 in line 63, 'No such connection CURRENT in line 63.'.
 [NO_PID]: sqlca: code: -220, state: 08003
-[NO_PID]: ECPGconnect: opening database connectdb on localhost port 0 for user connectuser
+[NO_PID]: ECPGconnect: opening database connectdb on localhost port 20 for user connectuser
 [NO_PID]: sqlca: code: 0, state: 00000
-[NO_PID]: connect: could not open database connectdb on localhost port 0 for user connectuser in line 66
+[NO_PID]: connect: could not open database connectdb on localhost port 20 for user connectuser in line 66
 	could not connect to server: Connection refused
 	Is the server running on host "localhost" and accepting
-	TCP/IP connections on port 0?
+	TCP/IP connections on port 20?
 
 [NO_PID]: sqlca: code: 0, state: 00000
 [NO_PID]: ecpg_finish: Connection connectdb closed.