Email sending problem from remote host since update to v94.0.2

Operating System & Version
Centos 7.5
cPanel & WHM Version
v94.0.3 Load Averages: 0.77 1.55 1.56

Galdon

Registered
Mar 18, 2021
3
0
1
Germany
cPanel Access Level
Website Owner
I have been sending emails on a centos 7 vps with Mautic application for years without problems.
Since i have updated cpanel version to v94.0.2 email sending is not more possible from mautic application with exim.
I get a swiftmailer error.

I use this settings to send email from mautic application:

Service to send mail through: Other SMTP Server
SMTP Host: 127.0.0.1
Port: 25
SMTP encryption type: none

Here is log output:

235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started
MAIL FROM: >> RCPT TO: >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >>
!! Connection to 127.0.0.1:25 Timed Out (code: 0)
(code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0)
Connection to 127.0.0.1:25 Timed Out\nLog data:
\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.xxx-xxx-xxx.com
ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 08:02:10 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>>
EHLO mailer.xxx.com\r\n\n<< 250-hosting.xxx-xxx-xxx.com Hello mailer.xxx.com [37.97.140.32]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>>
AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n
<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>>
MAIL FROM:\r\n\n>> RCPT TO:\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>>
\r\n.\r\n\n!! Connection to mailer.xxx.com:25 Timed Out (code: 0) at /home/mailer/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0):
Connection to mailer.xxx.com:25 Timed Out at /home/mailer/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []


Can anyone help?
 
Last edited by a moderator:

cPRex

Jurassic Moderator
Staff member
Oct 19, 2014
6,092
780
313
cPanel Access Level
Root Administrator
Hey there! That log shows the connection to the remote system timing out. Can you try running this command manually on your server to see if you can connect?

Code:
telnet mailer.xxx.com 25
You'll just need to include the full domain name there that you previously redacted.
 

Galdon

Registered
Mar 18, 2021
3
0
1
Germany
cPanel Access Level
Website Owner
Hi
Tahnks for your help.

I can connect with telnet.
output:

Trying 37.97.xxx.xx...
Connected to mailer.xxx.com.
Escape character is '^]'.
220-hosting.xxx-xxx-xxx.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 18:56:05 +0100
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
 

Galdon

Registered
Mar 18, 2021
3
0
1
Germany
cPanel Access Level
Website Owner
I can also send a testmail from the mautic configuration page which also arrives.

But when I start the sending process, no progress is displayed on the status page and I have these errors in the log file.


[2021-03-18 08:02:40] mautic.ERROR: [MAIL ERROR] Connection to mailer.xxxxx.com:25 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 08:02:10 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [37.97.140.32] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to mailer.xxxxx.com:25 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to mailer.xxxxx.com:25 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 08:02:10 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [37.97.140.32]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to mailer.xxxxx.com:25 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to mailer.xxxxx.com:25 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
[2021-03-18 09:52:01] mautic.ERROR: [MAIL ERROR] Connection to 127.0.0.1:25 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:51:31 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to 127.0.0.1:25 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to 127.0.0.1:25 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:51:31 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to 127.0.0.1:25 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to 127.0.0.1:25 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
[2021-03-18 09:52:41] mautic.ERROR: [MAIL ERROR] Connection to 127.0.0.1:25 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:52:11 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to 127.0.0.1:25 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to 127.0.0.1:25 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:52:11 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to 127.0.0.1:25 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to 127.0.0.1:25 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
[2021-03-18 09:56:40] mautic.ERROR: [MAIL ERROR] Connection to 127.0.0.1:25 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:56:10 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to 127.0.0.1:25 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to 127.0.0.1:25 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:56:10 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to 127.0.0.1:25 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to 127.0.0.1:25 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
[2021-03-18 09:57:28] mautic.ERROR: [MAIL ERROR] Connection to 127.0.0.1:25 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:56:58 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to 127.0.0.1:25 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to 127.0.0.1:25 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:56:58 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to 127.0.0.1:25 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to 127.0.0.1:25 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
[2021-03-18 09:58:16] mautic.ERROR: [MAIL ERROR] Connection to 127.0.0.1:587 Timed Out Log data: ++ Starting Swift_Transport_EsmtpTransport << 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:57:46 +0100 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >> EHLO mailer.xxxxx.com << 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1] 250-SIZE 52428800 250-8BITMIME 250-PIPELINING 250-X_PIPE_CONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ== << 334 UGFzc3dvcmQ6 >> QmVsbGF2aXN0YSgwMDE2KQ== << 235 Authentication succeeded ++ Swift_Transport_EsmtpTransport started >> MAIL FROM:<[email protected]> >> RCPT TO:<[email protected]> >> DATA << 250 OK << 250 Accepted << 354 Enter message, ending with "." on a line by itself >> . !! Connection to 127.0.0.1:587 Timed Out (code: 0) (send); [email protected] {"exception":"[object] (Swift_TransportException(code: 0): Connection to 127.0.0.1:587 Timed Out\nLog data:\n++ Starting Swift_Transport_EsmtpTransport\n<< 220-hosting.yyyy-yyyy-yyyy.com ESMTP Exim 4.94 #2 Thu, 18 Mar 2021 09:57:46 +0100 \r\n220-We do not authorize the use of this system to transport unsolicited, \r\n220 and/or bulk e-mail.\r\n\n>> EHLO mailer.xxxxx.com\r\n\n<< 250-hosting.yyyy-yyyy-yyyy.com Hello mailer.xxxxx.com [127.0.0.1]\r\n250-SIZE 52428800\r\n250-8BITMIME\r\n250-PIPELINING\r\n250-X_PIPE_CONNECT\r\n250-AUTH PLAIN LOGIN\r\n250-STARTTLS\r\n250 HELP\r\n\n>> AUTH LOGIN\r\n\n<< 334 VXNlcm5hbWU6\r\n\n>> bmV3c0BtYWlsZXIubmV1ZXJvdGlrLmNvbQ==\r\n\n<< 334 UGFzc3dvcmQ6\r\n\n>> QmVsbGF2aXN0YSgwMDE2KQ==\r\n\n<< 235 Authentication succeeded\r\n\n++ Swift_Transport_EsmtpTransport started\n>> MAIL FROM:<[email protected]>\r\n\n>> RCPT TO:<[email protected]>\r\n\n>> DATA\r\n\n<< 250 OK\r\n\n<< 250 Accepted\r\n\n<< 354 Enter message, ending with \".\" on a line by itself\r\n\n>> \r\n.\r\n\n!! Connection to 127.0.0.1:587 Timed Out (code: 0) at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Plugins/LoggerPlugin.php:124, Swift_IoException(code: 0): Connection to 127.0.0.1:587 Timed Out at public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:166)"} []
 

cPRex

Jurassic Moderator
Staff member
Oct 19, 2014
6,092
780
313
cPanel Access Level
Root Administrator
Thanks for the additional details. It's good that the manual test with telnet is working, so we can be assured the connection between the systems is good.

It might be best to contact the developer of the application to see if they have any ideas on that specific error, as the server-side connections appear to be working well, but the application itself is timing out when trying to use them.