diff --git a/py_opengauss/driver/dbapi20.py b/py_opengauss/driver/dbapi20.py
index aa8c88c5c9f4de847f0236b215e2359655258e84..1c425accdde14f2a3ffc4709f00af777f40b7d25 100644
--- a/py_opengauss/driver/dbapi20.py
+++ b/py_opengauss/driver/dbapi20.py
@@ -434,10 +434,11 @@ def connect(**kw):
 		for addr in addrs:
 			param = deepcopy(kw)
 			if ":" in addr:
-				host, str_port = addr.strip().split(':')
-				port = int(str_port)
-				param['host'] = host
-				param['port'] = port
+				parts = addr.strip().rsplit(":", 1)
+                host, str_port = parts
+                port = int(str_port)
+                param['host'] = host
+                param['port'] = port
 			else:
 				param['host'] = addr
 			kws.append(param)
diff --git a/py_opengauss/resolved/riparse.py b/py_opengauss/resolved/riparse.py
index 0c205d3f331752425f3c93443ee4529cf24ff8b3..c3ca0eb16b717f221a4c29e4d38b73328fdccb22 100644
--- a/py_opengauss/resolved/riparse.py
+++ b/py_opengauss/resolved/riparse.py
@@ -225,28 +225,28 @@ def unsplit(t):
 	return s
 
 def split_ip(ip, fieldproc = unescape):
-	if ip[0] == '[':
-		# IPvN addr
-		next_pos = ip.find(']')
-		if next_pos == -1:
-			# unterminated IPvN block
-			next_pos = len(ip) - 1
-		addr = ip[:next_pos + 1]
-		pos = next_pos + 1
-		next_pos = addr.find(':', pos)
-		if next_pos == -1:
-			port = None
-		else:
-			port = fieldproc(addr[next_pos + 1:])
-	else:
-		next_pos = ip.find(':')
-		if next_pos == -1:
-			addr = fieldproc(ip)
-			port = None
-		else:
-			addr = fieldproc(ip[:next_pos])
-			port = fieldproc(ip[next_pos + 1:])
-	return addr, port
+    if ip[0] == '[':
+        # IPvN addr
+        next_pos = ip.find(']')
+        if next_pos == -1:
+            # unterminated IPvN block
+            next_pos = len(ip) - 1
+        addr = ip[:next_pos + 1]
+        pos = next_pos + 1
+        next_pos = ip.find(':', pos)
+        if next_pos == -1:
+            port = None
+        else:
+            port = fieldproc(ip[next_pos + 1:])
+    else:
+        next_pos = ip.rfind(':')
+        if next_pos == -1:
+            addr = fieldproc(ip)
+            port = None
+        else:
+            addr = fieldproc(ip[:next_pos])
+            port = fieldproc(ip[next_pos + 1:])
+    return addr, port
 
 def split_netloc(netloc, fieldproc = unescape):
 	"""