Home » Kerio User Forums » Kerio Connect » too many simultaneous connections
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Werner

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since the last Update Kerio connect, our customer, 2 Windows-User, 8 Apple User, is connecting Kerio Connect with firefox or Chrome in Windows 10, after a while connections are denied and the server shows this message: too many simultaneous connections. Explorer is running without problems. Any idea? Thank you.
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ian.bugeja

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Can you clarify what Kerio Connect version you have, please?

Ian Bugeja
GFI Software
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Werner

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it's version 9.2.7 for Windows
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ian.bugeja

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Please update to 9.2.7 p3

Ian Bugeja
GFI Software
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lkacian

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No Message Body

[Updated on: Fri, 28 September 2018 12:49]

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SiriusMac

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Ian,
I am also seeing the error in Security Log "[22/Oct/2018 15:24:14] HTTPS connection from IP address 192.168.10.1 rejected: too many simultaneous connections (101 connections, limit 100)" where x.x.10.1 is our router.

Kerio Connect 9.2.7p3 on macOS 10.12.6, updated 3 days ago from 9.2.5p3. We think, based on users lunch patterns and matching up the Audit log entries, that that majority of the connection are ActiveSync iPhone and Android users, though I don't think this an ActiveSync issue, rather an issue where connections are logged coming from the router IP, not the client IP.
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dolfs

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Same problem here. Updated to 9.2.7 p3 but again received HTTPS simultaneous connections problem. We currently have 250 connection limit.
It's also hard to investigate because one user creates approx 5 connections (that's what we see in active connection window for KOFF and ActiveSync).
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lkacian

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Simple solution:
- stop Kerio Connect
- edit manually mailserver.cfg :
...
Section:
<table name="service-https">
<variable name="MaxConnectionsIP">100</variable>
change 100 to 600 for example

- save
- start Kerio Connect
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dhendr@tlcd

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Have the same problem after upgrading 10-19-18 to 9.2.7 P3 from 9.2.5 P3. This was not a problem in 9.2.5 P3 and seems to be a bug that needs patching.

I'm inclined to disagree with your 'Simple solution:' suggestion to adjust MaxConnectionsIP from 100 to 600. Which is only a band aid to a bigger problem...perhaps Kerio developers need to take a closer look.
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SiriusMac

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I found a solution in my environment for the "Too many simultaneous connections" via https where the IP in question was the LAN IP of my router instead of the LAN IP of the client devices. My Kerio Connect is on premise, and thus on a LAN connection. I added a host table entry to my router/dns forwarding service to point LAN traffic to the LAN IP, rather than the public WAN IP of Kerio Connect.

In Kerio Control, for example, this is done in admin console > Configuration > DNS > Local DNS Lookup > Hosts Table > Edit.... and enter a LAN IP address for Kerio Connect.

After applying that change, and then flushing the DNS cache of the client devices, Kerio Connect reported the connections coming from the client IP address instead of from the router IP address.

[Updated on: Thu, 25 October 2018 04:27]

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lkacian

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@dhendr@tlcd
I agree with you that this is only small aid.
But this is only only emergency assistance which helps to my customer with 250 accounts.
Last stable is only 9.2.5 P3
There are no Kerio developers anymore. Only GFI.

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