lost connection after data

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lost connection after data

Selcuk Yazar
Hi, 

Our users try to get e-mail from turnitin.com, but we have error like below. It seems same IP address with different mx records. How can we resolve this.


thanks in advance.

postfix/policy-spf[10024]: : Policy action=PREPEND Received-SPF: pass (turnitin.com: 199.47.85.44 is authorized to use '[hidden email] (mailto:[hidden email])' in 'mfrom' identity (mechanism 'ip4:199.47.80.0/21' matched)) receiver=mail.trakya.edu.tr; identity=mailfrom; envelope-from="[hidden email] (mailto:[hidden email])"; helo=mx2.turnitin.com; client-ip=199.47.85.44

host=199.47.85.44, helo=mx2.turnitin.com

postfix/smtpd[6055]: lost connection after DATA (3865 bytes) from mx2.iparadigms.com[199.47.85.44] 


;; ANSWER SECTION:
mx2.turnitin.com.       900     IN      A       199.47.85.44

;; AUTHORITY SECTION:
turnitin.com.           14182   IN      NS      ns-1415.awsdns-48.org.
turnitin.com.           14182   IN      NS      ns-58.awsdns-07.com.
turnitin.com.           14182   IN      NS      ns-1607.awsdns-08.co.uk.
turnitin.com.           14182   IN      NS      ns-721.awsdns-26.net.



;; ANSWER SECTION:
mx2.iparadigms.com.     900     IN      A       199.47.85.44

;; AUTHORITY SECTION:
iparadigms.com.         153342  IN      NS      ns-1419.awsdns-49.org.
iparadigms.com.         153342  IN      NS      ns-1801.awsdns-33.co.uk.
iparadigms.com.         153342  IN      NS      ns-644.awsdns-16.net.
iparadigms.com.         153342  IN      NS      ns-323.awsdns-40.com.




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Re: lost connection after data

Wietse Venema
Selcuk Yazar:
> postfix/smtpd[6055]: lost connection after DATA (3865 bytes) from
> mx2.iparadigms.com[199.47.85.44]

Possible cause:

- Broken WSCALE (window scaling).
  https://en.wikipedia.org/wiki/TCP_window_scale_option

Less likely, because the failure happened after 3865 bytes:

- Broken MTU (maximum transmission unit).
  https://en.wikipedia.org/wiki/Maximum_transmission_unit

Or something else :-)

Only a network sniffer recording can tell.

        Wietse