Issue with XPC communication between Network Extension and host application

Hello,

I need to develop a Network Extension (Transparent Proxy) that sends data to the host application for analysis. Network Extension - XPC client Host application - XPC service

I am trying to implement it with XPC. However, when attempting to connect, I see the following error in the system logs on client side.

[0x1015a2050] failed to do a bootstrap look-up: xpc_error=[3: No such process]

I assume the problem occurs because the Network Extension cannot find the registered XPC service. On the service side, I see the following message in the logs:

2026-02-24 13:15:36.419345+0300  localhost fgstnehost[58884]: (libxpc.dylib) [com.apple.xpc:connection] [0x100bdee70] activating connection: mach=true listener=true peer=false name=TEAM_ID.group.app_id.netfilter.xpc

Entitlements Network Extension:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.developer.networking.networkextension</key>
	<array>
		<string>app-proxy-provider-systemextension</string>
	</array>
    <key>com.apple.security.application-groups</key>
    <array>
        <string>TEAM_ID.group.app_id.netfilter</string>
    </array>
    <key>com.apple.security.app-sandbox</key>
    <true/>
    <key>com.apple.security.xpc.mach-lookup.global-name</key>
    <array>
        <string>TEAM_ID.group.app_id.netfilter.xpc</string>
    </array>
</dict>
</plist>

Entitlements host application:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>com.apple.developer.networking.networkextension</key>
	<array>
		<string>app-proxy-provider-systemextension</string>
	</array>
	<key>com.apple.developer.system-extension.install</key>
	<true/>
    <key>com.apple.security.application-groups</key>
    <array>
        <string>TEAM_ID.group.app_id.netfilter</string>
    </array>
    <key>com.apple.security.app-sandbox</key>
    <true/>
    <key>com.apple.security.xpc.mach-service.name</key>
    <array>
        <string>TEAM_ID.group.app_id.netfilter.xpc</string>
    </array>
</dict>
</plist>

Server.m

@interface XPCServer ()
    @property (nonatomic, strong) NSXPCListener *listener;
@end

@implementation XPCServer

- (instancetype) init
{
    self = [super init];

    if (self != nil)
    {
        _listener = [[NSXPCListener alloc] initWithMachServiceName: XPC_SERVICE_ID];
        _listener.delegate = self;
    }

    return self;
}

- (void) start
{
    [self.listener resume];
}

- (BOOL) listener:(NSXPCListener *) listener shouldAcceptNewConnection:(NSXPCConnection *) newConnection
{
    return YES;
}

@end

Client.m

@interface XPCClient ()
	@property (nonatomic, strong) NSXPCConnection *connection;
@end


@implementation XPCClient

- (void) connect
{
    self.connection = [[NSXPCConnection alloc] initWithMachServiceName: XPC_SERVICE_ID options: NSXPCConnectionPrivileged];

    self.connection.invalidationHandler =
    ^{
        [[OSLogger sharedInstance] error: "XPCClient: connection can not be formed or the connection has terminated and may not be re-established"];
    };

    self.connection.interruptionHandler =
    ^{
        [[OSLogger sharedInstance] error: "XPCClient: the remote process exits or crashes"];
    };

    [self.connection resume];
}

@end

What could be the root cause of this issue? Are there any recommendations for implementing IPC between a Network Extension and aß Host Application?

Thank you in advance.