Thunderbird ?SMTP? connection

Comodo Internet Security - CIS Firewall Help - CIS
#1

Hello all,
once I activate COMODO firewall (either with its default profiles or mine) I cannot longer use the SMTP and send/receive emails on Thunderbird.
I added the Thunderbird as an “Allowed application” but it didn’t solve the problem. The port 587 is in the list (I also added a range of ports).
In my profile I could see a request to 127.0.0.1:12465 and no matter if I select Allowed app, or Email client, or I just allow for that specific request, it doesn’t work.
There is no other entry in logfiles.

I also disabled “Filter loopback” on 127., but no success. What should I do ?

#2

Make sure the Windows firewall is turned off. Try to disable the firewall setting block fragmented IP traffic. Finally, you might need to create a global rule to allow incoming connections, you can temporary use the stealth ports firewall task and select alert incoming connections.

#3

“Block fragmented traffic”, disabled → no connection
“Global rule with source-any, destination-any, source Port-any, destination Port-any” → no connection
“Stealth ports-Alert Incoming Connection” → no connection.

The other connections (i.e., browser, radio, network) are fine.

#4

Go to Firewall → Application rules, find Thunderbird and select Treat as → Email Client.

By the way, it could be a problem with your email provider, sometimes they change the SMTP settings.

#5

Already set as Email Client, or Allowed app, or set manually for each port/IP; I’ve deleted this rule several times. I also enabled/disabled “do not show popup” for “allow requests”, disabled “loopback traffic”, disabled Windows firewall, “Alert Incoming connections” on stealth ports.
There are only two calls when I start Thunderbird: one is for 127.0.01:50705 and another one to 63.245.213.24:443.
When I disable the firewall completely, the client connects properly.

#6

Its weird that you can’t get it to work, I tried myself and have no problems using thunderbird to access my e-mail account, I didn’t need to set any rules. What OS are you using and do you have any other security software running?

#7

On other network and other computer, Thunderbird works properly with the same settings (so it has to do with this specific computer and network; I’ve already reinstalled 2 times COMODO on this unit and it didn’t solve the problem).
Also, on this computer I have a local email address and two Gmails (without the passwords saved); once the firewall is up and I start Thunderbird, there is no request for entering the passwords.

#8

Do a reputation check, and analyze what it says!

Via translator

:-TU

#9

Sorry, but what to check ? …and what translator ?

#10

See in the Ratting Scan if Thunderbird is “trusted”!

I’m using the translator to post! I’m in Brazil!

#11

I checked, and it is already trusted (and so the vendor, Mozilla).

Add to allowed app. doesn’t solve this issue either:

https://s18.postimg.org/dyaqucogp/2017_03_10_13_17_48_COMODO_Internet_Security_Pre.png

#12

It was a try! Am sorry!

:slight_smile:

#13

Don’t worry; there is a reason why COMODO blocks the connection, but I can’t figure out why (and I use this firewall since 2008-2009). I’ve never had this kind of problem (or at least nothing which couldn’t been solved). I’m sure it has something to do with this specific network.

#14

After many tests and changes, the conclusion is that COMODO has became a total ■■■■. It doesn’t address properly 127.X.X.X (even when it is disabled). It is time to change it with something better.

#15

Try :
ipconfig /flushdns
ipconfig /registerdns

Please provide output from following commands:
ping 127.0.0.1
ping -4 localhost