[ANDiv1976]

Это не контрол рубит соединение, а коннект. В логах коннекта что? И зачем вообще порт 7654 перенаправлять на 993? »

Вы уверены что именно коннект?
перенаправление сделал чтобы проверить - вообще есть соединение по 993 порту на коннекте

вот лог на коннекте при попытке соединиться на 993 порт через контрол.
порт 993 замаппен

[11/Jun/2019 06:22:38][23788] {imaps} Task 7934 handler BEGIN [11/Jun/2019 06:22:38][23788] {conn} Connection from <внешний ip>:51361 to 192.168.1.224:993, socket 18428. [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL handshake started: before/accept initialization [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:before/accept initialization [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv2/v3 read client hello A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 Client requests server by name: <наш ip> [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 Used default server context for connection by name: <наш ip> [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 read client hello A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write server hello A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write certificate A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write key exchange A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write server done A [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 flush data [11/Jun/2019 06:22:38][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv3 read client certificate A [11/Jun/2019 06:22:57][23788] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv3 read client certificate A [11/Jun/2019 06:22:57][23788] {conn} Cannot accept SSL connection from <внешний ip>:51361 to 192.168.1.224:993: SSL code 5, system error: (0) Операция успешно завершена. [11/Jun/2019 06:22:57][23788] {imaps} Task 7934 handler END [11/Jun/2019 06:22:57][23788] {conn} Closing socket 18428

вот лог если подключаться через 7990, с маппингом на 993

[11/Jun/2019 06:23:10][28152] {imaps} Task 7935 handler BEGIN [11/Jun/2019 06:23:10][28152] {conn} Connection from <внешний ip>:52236 to 192.168.1.224:993, socket 16796. [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL handshake started: before/accept initialization [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:before/accept initialization [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv2/v3 read client hello A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 Client requests server by name: <наш ip> [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 Used default server context for connection by name: <наш ip> [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 read client hello A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write server hello A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write certificate A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write key exchange A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write server done A [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 flush data [11/Jun/2019 06:23:10][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv3 read client certificate A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:error in SSLv3 read client certificate A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 read client key exchange A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 read certificate verify A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 read finished A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write session ticket A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write change cipher spec A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 write finished A [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL_accept:SSLv3 flush data [11/Jun/2019 06:23:11][28152] {conn} SSL debug: id 000000000C4973A0 SSL handshake done: SSL negotiation finished successfully [11/Jun/2019 06:23:11][28152] {conn} Established secure server connection from <внешний ip>:52236 to 192.168.1.224:993 using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384, id 0000000004FBAF58 [11/Jun/2019 06:23:11][28152] {imaps} Task 7935 handler starting [11/Jun/2019 06:23:11][28152] {imaps} IMAPS server session begin; client connected from <внешний ip>:52236 [11/Jun/2019 06:23:25][28152] {imaps} Command afafas [11/Jun/2019 06:23:27][28152] {conn} Cannot read/write from/to SSL connection (remote=<внешний ip>:52236, local=192.168.1.224:993): SSL code 5, system error: (0) Операция успешно завершена. [11/Jun/2019 06:23:27][28152] {imaps} Session end, error reading line: (10035) Операция на незаблокированном сокете не может быть завершена немедленно. [11/Jun/2019 06:23:27][28152] {imaps} Server session end [11/Jun/2019 06:23:27][28152] {conn} Cannot read/write from/to SSL connection (remote=<внешний ip>:52236, local=192.168.1.224:993): SSL code 5, system error: (0) Операция успешно завершена. [11/Jun/2019 06:23:27][28152] {conn} Cannot read/write from/to SSL connection (remote=<внешний ip>:52236, local=192.168.1.224:993): SSL code 5, system error: (0) Операция успешно завершена. [11/Jun/2019 06:23:27][28152] {conn} Closing socket 16796 [11/Jun/2019 06:23:27][28152] {imaps} Task 7935 handler END

так же прикрепил скриншот правил для почтовика на керио контроле