Overnight one of the servers I have a connection to went down, the Core Tunnel app still showed it was connected despite this not been possible.
Is there possibly an issue with the connection status if this happens?
That might be a bug, are you able to reproduce it? If yes, please post the steps.
Next time you run into this issue, could you please have a look how many processes named "io.coressh.xpc.ssh"?
Core Tunnel spawns an "io.coressh.xpc.ssh" for each of connected tunnel, if you have 5 connected tunnels, then there should have 5 "io.coressh.xpc.ssh" processes, no more or less.
Came back to disconnected tunnels. Running Amphetamine session so system sleep shouldn't have occurred.
Logs from pressing the arrow:
02:55:04 Connecting…
02:55:04 Authenticating…
02:55:06 Connected
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15:56:57 accept: Too many open files
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16:02:39 accept: Too many open files
16:02:40 accept: Too many open files
16:02:41 accept: Too many open files
16:02:42 accept: Too many open files
16:02:43 accept: Too many open files
16:07:32 accept: Too many open files
16:07:33 accept: Too many open files
16:07:34 accept: Too many open files
16:07:35 accept: Too many open files
16:07:36 accept: Too many open files
16:07:37 accept: Too many open files
16:13:18 accept: Too many open files
16:13:19 accept: Too many open files
16:13:20 accept: Too many open files
16:13:21 accept: Too many open files
16:13:22 accept: Too many open files
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16:18:12 accept: Too many open files
16:18:13 accept: Too many open files
16:18:14 accept: Too many open files
16:18:15 accept: Too many open files
16:18:16 accept: Too many open files
16:18:17 accept: Too many open files
16:23:58 accept: Too many open files
16:23:59 accept: Too many open files
16:24:00 accept: Too many open files
16:24:01 accept: Too many open files
16:24:02 accept: Too many open files
16:24:03 accept: Too many open files
16:28:52 accept: Too many open files
16:28:53 accept: Too many open files
16:28:54 accept: Too many open files
16:28:55 accept: Too many open files
16:28:56 accept: Too many open files
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16:34:38 accept: Too many open files
16:34:39 accept: Too many open files
16:34:40 accept: Too many open files
16:34:41 accept: Too many open files
16:34:42 accept: Too many open files
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16:39:32 accept: Too many open files
16:39:33 accept: Too many open files
16:39:34 accept: Too many open files
16:39:35 accept: Too many open files
16:39:36 accept: Too many open files
16:39:37 accept: Too many open files
16:45:18 accept: Too many open files
16:45:19 accept: Too many open files
16:45:20 accept: Too many open files
16:45:21 accept: Too many open files
16:45:22 accept: Too many open files
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16:50:12 accept: Too many open files
16:50:13 accept: Too many open files
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16:50:15 accept: Too many open files
16:50:16 accept: Too many open files
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16:55:59 accept: Too many open files
16:56:00 accept: Too many open files
16:56:01 accept: Too many open files
16:56:02 accept: Too many open files
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17:00:52 accept: Too many open files
17:00:53 accept: Too many open files
17:00:54 accept: Too many open files
17:00:55 accept: Too many open files
17:00:56 accept: Too many open files
17:00:57 accept: Too many open files
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17:06:39 accept: Too many open files
17:06:40 accept: Too many open files
17:06:41 accept: Too many open files
17:06:42 accept: Too many open files
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17:11:32 accept: Too many open files
17:11:33 accept: Too many open files
17:11:34 accept: Too many open files
17:11:35 accept: Too many open files
17:11:36 accept: Too many open files
17:11:37 accept: Too many open files
17:17:18 accept: Too many open files
17:17:19 accept: Too many open files
17:17:20 accept: Too many open files
17:17:21 accept: Too many open files
17:17:22 accept: Too many open files
17:17:23 accept: Too many open files
17:22:12 accept: Too many open files
17:22:13 accept: Too many open files
17:22:14 accept: Too many open files
17:22:15 accept: Too many open files
17:22:16 accept: Too many open files
17:22:17 accept: Too many open files
17:27:58 accept: Too many open files
17:27:59 accept: Too many open files
17:28:00 accept: Too many open files
17:28:01 accept: Too many open files
17:28:02 accept: Too many open files
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17:32:52 accept: Too many open files
17:32:53 accept: Too many open files
17:32:54 accept: Too many open files
17:32:55 accept: Too many open files
17:32:56 accept: Too many open files
17:32:57 accept: Too many open files
17:38:38 accept: Too many open files
17:38:39 accept: Too many open files
17:38:40 accept: Too many open files
17:38:41 accept: Too many open files
17:38:42 accept: Too many open files
17:38:43 accept: Too many open files
17:43:32 accept: Too many open files
17:43:33 accept: Too many open files
17:43:34 accept: Too many open files
17:43:35 accept: Too many open files
17:43:36 accept: Too many open files
17:43:37 accept: Too many open files
17:46:02 accept: Too many open files
17:46:03 accept: Too many open files
17:46:04 accept: Too many open files
17:46:05 accept: Too many open files
17:46:06 accept: Too many open files
17:46:07 accept: Too many open files
17:46:08 accept: Too many open files
17:46:09 accept: Too many open files
17:46:10 accept: Too many open files
17:46:11 accept: Too many open files
17:46:12 accept: Too many open files
17:46:13 accept: Too many open files
17:46:14 accept: Too many open files
17:46:15 accept: Too many open files
17:46:16 accept: Too many open files
17:46:17 accept: Too many open files
17:46:18 accept: Too many open files
17:46:19 accept: Too many open files
17:46:20 accept: Too many open files
17:46:21 accept: Too many open files
17:46:23 accept: Too many open files
17:46:24 accept: Too many open files
17:46:25 accept: Too many open files
17:46:28 accept: Too many open files
17:46:29 accept: Too many open files
17:46:30 accept: Too many open files
17:47:19 Disconnecting…
17:47:19 Disconnected
--------------------------------------------------------------------------------
17:47:20 Connecting…
17:47:20 Authenticating…
17:47:21 Connected
Have a look at your soft and hard max files limits using commands:
# soft limits
ulimit -n
# hard limits
ulimit -n -H
If the output shows a small value, e.g. 1024 in my case, then it might be the real cause. Try to rise the value by following this answer on stackexchange:
ulimit -n
7168
ulimit -n -H
unlimited
Did you tried rising soft limits?
Could you please post a screenshot of your port forwarding list?
Happened again, I rebooted a machine I tunnel through and the connection indicated it was ok (green) but no traffic was passing through.
Here's a screen shot before I disconnected and reconnected showing 3 processes still active
Having disconnected and reconnected working fine again.
Well, I misunderstood what you mean, sorry 
I thought Core Tunnel failed to route traffic despite the remote side still alive. The actual situation is the remote side became unresponsive, but Core Tunnel didn't disconnect as expected.
To let Core Tunnel detects if server still alive, we must set ServerAliveCountMax and ServerAliveInterval explicitly:
In next alpha, new tunnels will have 3 for ServerAliveCountMax and 15 for ServerAliveInterval as default values.
Forgot to mention, TCPKeepAlive must set to no.