Since Updating our SG550 to 9.706.9 we have trouble with mail. E-Mails are delayed or even not delivered at all.
E-Mail senders get the following message:
Remote Server returned '554 5.4.0 < #4.0.0 X-Proxmox; delivery temporarily suspended: host x.x.x.x[x.x.x.x] refused to talk to me: 421 Too many concurrent SMTP connections; please try again later.>'
or: 4188.8.131.52 connection dropped due to TimeOut
I also recognize high cpu load (100%) on exim processes
In smtp log I often see tcp connection count 25, so all allowed connection are beeing used.
When increasing the allowed connections whole utm perfomance goes down and httpproxy will be very sloooow .
Max connection: 25 (default: 20)
Max connections / host: 15 (default: 10)
Any ideas for me?
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