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pablomedok's questions

Martin Hope
pablomedok
Asked: 2013-12-27 15:26:50 +0800 CST
  • 0

I searched a lot about the question, but can't find solution for my situation.

We've got a Windows 2003 server that runs Advantage Database Server (ADS) through which our site connects to our accounting system. The site connects to static IP 82.xxx.xxx.147, runs several queries and disconnects. And does it every 5 minutes. Server has 2 NICs - one is for the site (192.168.5.1), another is for local network (192.168.0.1). Server connected to internet via ADSL modem/router (LAN IP 192.168.5.9), router's NAT is configured to forward port 45677 to the server.

Everything works fine, except for one thing - internet connection is not stable enough. So we got another ADSL connection with another IP address 178.xxx.xxx.181 and also forwarded that port to the server. Second modem/router's LAN IP is 192.168.5.3.

Our site is checking IP address 82.xxx.xxx.147 and if it's not responding, it tries another IP 178.xxx.xxx.181. But it doesn't connect. It looks like server rejects connections from the second router.

I tried to add second router's IP 192.168.5.9 as a second gateway in advanced TCP/IP settings of to server NIC's. But it doesn't help.

I understand, that it's something connected with routes, but I can't understand anything in those masks, metrics, gateway IPs. It's too tough for me.

I don't want the server to use any of the gateways for internet access (browser and other services). I just want it to receive incoming connections from both gateway IPs from fixed port number. Is that possible?

windows
Martin Hope
pablomedok
Asked: 2012-03-03 12:45:01 +0800 CST
  • 11

I've got a problem with Gmail.

It started after one of our trojan infected PCs sent spam for one day from our IP address.

We've fixed the problem, but we got into 3 black lists. We've fixed that, too. But still every time we send an email to Gmail the message is rejected:

So I've checked Google Bulk Sender's guide once again and found an error in our SPF record and fixed it. Google says everything should become fine after some time, but this doesn't happen. 3 weeks already passed but we still can't send emails to Gmail.

Our MX setup is a bit complex, but not too much: We have a domain name delo-company.com, it has it's own mail @delo-company.com (this one is fine, but the problems are with sub-domain name corp.delo-company.com).

Delo-company.com domain has several DNS records for the subdomain:

corp                     A     82.209.198.147
corp                     MX    20 corp.delo-company.com
corp.delo-company.com    TXT   "v=spf1 ip4:82.209.198.147 ~all"

(I set ~all for testing purposes only, it was -all before that)

These records are for our corporate Exchange 2003 server at 82.209.198.147. Its LAN name is s2.corp.delo-company.com so its HELO/EHLO greetings are also s2.corp.delo-company.com.

To pass EHLO check we've also created some records in delo-company.com's DNS:

s2.corp                  A     82.209.198.147
s2.corp.delo-company.com TXT   "v=spf1 ip4:82.209.198.147 ~all"

As I understand SPF verifications should be passed in this way: Out server s2 connects to MX of the recepient (Rcp.MX): EHLO s2.corp.delo-company.com Rcp.MX says Ok, and makes SPF check of HELO/EHLO. It does NSlookup for s2.corp.delo-company.com and gets the above DNS-records. TXT records says that s2.corp.delo-company.com should be only from IP 82.209.198.147. So it should be passed.

Then our s2 server says RCPT FROM: Rcp.MX` server checks it, too. The values are the same so they should also be positive.

Maybe there is also a rDNS check, but I'm not sure what is checked HELO or RCPT FROM.

Our PTR record for 82.209.198.147 is:

147.198.209.82.in-addr.arpa. 86400 IN PTR s2.corp.delo-company.com.

To me everything looks fine, but anyway all emails are rejected by Gmail.

So, I've checked MXtoolbox.com - it says everything is fine, I passed http://www.kitterman.com/spf/validate.html Python check, I did 25port.com email test. It's fine, too:

Return-Path: <[email protected]>
Received: from s2.corp.delo-company.com (82.209.198.147) by verifier.port25.com id ha45na11u9cs for <[email protected]>; Fri, 2 Mar 2012 13:03:21 -0500 (envelope-from <[email protected]>)
Authentication-Results: verifier.port25.com; spf=pass [email protected]
Authentication-Results: verifier.port25.com; domainkeys=neutral (message not signed) [email protected]
Authentication-Results: verifier.port25.com; dkim=neutral (message not signed)
Authentication-Results: verifier.port25.com; sender-id=pass [email protected]
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="----_=_NextPart_001_01CCF89E.BE02A069"
Subject: test
Date: Fri, 2 Mar 2012 21:03:15 +0300
X-MimeOLE: Produced By Microsoft Exchange V6.5
Message-ID: <[email protected]>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
Thread-Topic: test
Thread-Index: Acz4jS34oznvbyFQR4S5rXsNQFvTdg==
From: =?koi8-r?B?89XQ0tXOwMsg8MHXxcw=?= <[email protected]>
To: <[email protected]>

I also checked with [email protected], but it FAILs all the time, no matter which SPF records I make:

<s2.corp.delo-company.com #5.7.1 smtp;550 5.7.1 <[email protected]>: Recipient address rejected: SPF Tests: Mail-From Result="softfail": Mail From="[email protected]" HELO name="s2.corp.delo-company.com" HELO Result="softfail" Remote IP="82.209.198.147">

I've filled Gmail form twice, but nothing happens.

We do not send spam, only emails for our clients. 2 or 3 times we did mass emails (like New Year Greetings and sales promos) from corp.delo-company.com addresses, but they where all complying to Gmail Bulk Sender's Guide (I mean SPF, Open Relays, Precedence: Bulk and Unsubscribe tags). So, this should be not a problem.

Please, help me. What am I doing wrong?

UPD: I also tried Unlocktheinbox.com test and the server also fails this test. Here is the result; here is one more.

I also tried to send email from that server manually via telnet and everything is fine. Here is what I type:

220 mx.google.com ESMTP g15si4811326anb.170
HELO s2.corp.delo-company.com
250 mx.google.com at your service
MAIL FROM: <[email protected]>
250 2.1.0 OK g15si4811326anb.170
RCPT TO: <[email protected]>
250 2.1.5 OK g15si4811326anb.170
DATA
354  Go ahead g15si4811326anb.170
From: [email protected]
To: Pavel <[email protected]>
Subject: Test 28

This is telnet test
.
250 2.0.0 OK 1330795021 g15si4811326anb.170
QUIT
221 2.0.0 closing connection g15si4811326anb.170

And this is what I get:

Delivered-To: [email protected]
Received: by 10.227.132.73 with SMTP id a9csp96864wbt;
        Sat, 3 Mar 2012 09:17:02 -0800 (PST)
Received: by 10.101.128.12 with SMTP id f12mr4837125ann.49.1330795021572;
        Sat, 03 Mar 2012 09:17:01 -0800 (PST)
Return-Path: <[email protected]>
Received: from s2.corp.delo-company.com (s2.corp.delo-company.com. [82.209.198.147])
        by mx.google.com with SMTP id g15si4811326anb.170.2012.03.03.09.15.59;
        Sat, 03 Mar 2012 09:17:00 -0800 (PST)
Received-SPF: pass (google.com: domain of [email protected] designates 82.209.198.147 as permitted sender) client-ip=82.209.198.147;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates 82.209.198.147 as permitted sender) [email protected]
Date: Sat, 03 Mar 2012 09:17:00 -0800 (PST)
Message-Id: <[email protected]>
From: [email protected]
To: Pavel <[email protected]>
Subject: Test 28

This is telnet test
email spam spf gmail