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Script_Guest

Massive Key Re-Exchange

We are having repeated key re-exchanges for over 10 minutes with large file. It has always worked in the past but this weekend it seems to be stuck in this process of key re-exchange.

Any thoughts on what we can try? We run WinSCP via script and download the file through SSIS. 
> 2021-10-11 06:17:25.828 Type: SSH_FXP_READ, Size: 37, Number: 1285
. 2021-10-11 06:17:59.284 Initiating key re-exchange (too much data received)
. 2021-10-11 06:17:59.316 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:17:59.382 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:17:59.382 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:17:59.382 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:17:59.382 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:18:32.479 Initiating key re-exchange (too much data received)
. 2021-10-11 06:18:32.512 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:18:32.578 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:18:32.578 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:18:32.578 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:18:32.578 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:19:06.026 Initiating key re-exchange (too much data received)
. 2021-10-11 06:19:06.058 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:19:06.124 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:19:06.124 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:19:06.125 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:19:06.125 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:19:40.126 Initiating key re-exchange (too much data received)
. 2021-10-11 06:19:40.160 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:19:40.224 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:19:40.224 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:19:40.224 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:19:40.224 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:20:14.900 Initiating key re-exchange (too much data received)
. 2021-10-11 06:20:14.932 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:20:14.997 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:20:14.997 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:20:14.997 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:20:14.997 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:20:47.918 Initiating key re-exchange (too much data received)
. 2021-10-11 06:20:47.947 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:20:48.014 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:20:48.014 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:20:48.015 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:20:48.015 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:21:24.396 Initiating key re-exchange (too much data received)
. 2021-10-11 06:21:24.427 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:21:24.491 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:21:24.491 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:21:24.491 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:21:24.491 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:22:00.490 Initiating key re-exchange (too much data received)
. 2021-10-11 06:22:00.519 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:22:00.584 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:22:00.584 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:22:00.584 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:22:00.584 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:22:35.913 Initiating key re-exchange (too much data received)
. 2021-10-11 06:22:35.941 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:22:36.007 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:22:36.007 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:22:36.007 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:22:36.007 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:23:10.227 Initiating key re-exchange (too much data received)
. 2021-10-11 06:23:10.259 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:23:10.323 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:23:10.323 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:23:10.324 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:23:10.324 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:23:45.440 Initiating key re-exchange (too much data received)
. 2021-10-11 06:23:45.498 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:23:45.565 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:23:45.565 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:23:45.565 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:23:45.565 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:24:19.714 Initiating key re-exchange (too much data received)
. 2021-10-11 06:24:19.745 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:24:19.809 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:24:19.809 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:24:19.809 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:24:19.810 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:24:54.102 Initiating key re-exchange (too much data received)
. 2021-10-11 06:24:54.134 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:24:54.198 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:24:54.198 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:24:54.198 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:24:54.198 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:25:28.818 Initiating key re-exchange (too much data received)
. 2021-10-11 06:25:28.852 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:25:28.920 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:25:28.920 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:25:28.920 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:25:28.920 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:26:03.813 Initiating key re-exchange (too much data received)
. 2021-10-11 06:26:03.840 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:26:03.905 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:26:03.905 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:26:03.905 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:26:03.905 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:26:39.244 Initiating key re-exchange (too much data received)
. 2021-10-11 06:26:39.275 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:26:39.339 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:26:39.339 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:26:39.340 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:26:39.340 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:27:14.363 Initiating key re-exchange (too much data received)
. 2021-10-11 06:27:14.394 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:27:14.460 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:27:14.460 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:27:14.460 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:27:14.460 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:27:48.930 Initiating key re-exchange (too much data received)
. 2021-10-11 06:27:48.960 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:27:49.027 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:27:49.027 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:27:49.027 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:27:49.027 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:28:24.297 Initiating key re-exchange (too much data received)
. 2021-10-11 06:28:24.328 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:28:24.393 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:28:24.393 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:28:24.393 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:28:24.393 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:28:59.460 Initiating key re-exchange (too much data received)
. 2021-10-11 06:28:59.492 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:28:59.556 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:28:59.556 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:28:59.557 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:28:59.557 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:29:34.320 Initiating key re-exchange (too much data received)
. 2021-10-11 06:29:34.351 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:29:34.416 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:29:34.416 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:29:34.416 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:29:34.416 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:30:08.252 Initiating key re-exchange (too much data received)
. 2021-10-11 06:30:08.283 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:30:08.348 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:30:08.348 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:30:08.348 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:30:08.348 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:30:42.822 Initiating key re-exchange (too much data received)
. 2021-10-11 06:30:42.853 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:30:42.918 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:30:42.918 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:30:42.918 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:30:42.918 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:31:17.697 Initiating key re-exchange (too much data received)
. 2021-10-11 06:31:17.736 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:31:17.801 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:31:17.801 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:31:17.802 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:31:17.802 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:31:53.303 Initiating key re-exchange (too much data received)
. 2021-10-11 06:31:53.333 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:31:53.397 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:31:53.397 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:31:53.397 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:31:53.397 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:32:28.118 Initiating key re-exchange (too much data received)
. 2021-10-11 06:32:28.148 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:32:28.212 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:32:28.213 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:32:28.213 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:32:28.213 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2021-10-11 06:33:03.496 Initiating key re-exchange (too much data received)
. 2021-10-11 06:33:03.529 Doing ECDH key exchange with curve nistp256 and hash SHA-256
. 2021-10-11 06:33:03.593 Initialised AES-256 SDCTR (AES-NI accelerated) outbound encryption
. 2021-10-11 06:33:03.593 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2021-10-11 06:33:03.593 Initialised AES-256 SDCTR (AES-NI accelerated) inbound encryption
. 2021-10-11 06:33:03.593 Initialised HMAC-SHA-256 inbound MAC algorithm

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