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Goals and Symptoms
Symptoms: Cannot connect to ION device using SER 7.4 or establishing connection very slow (up to ten minutes)
Keywords: SER 7.4, ION, Serial, ION reconnection, multiple connections
Causes and Fixes
Cause: ION Devices have connection limitations which may cause issues with SER 7.4 while simultaneously connecting from other software.
SER 7.4 supports connections to an ION 7550, ION 7650, and ION 8600. The ION 7550 and ION 7650 with firmware versions V360 or later support 8 direct TCP/IP connections. Earlier firmware versions of the ION 7550 and ION 7650 as well as all firmware versions of the ION 8600 only support 4 direct connections. For instance if ION E 6 Management Console, two ION Setup connections and a Telnet connection were all connected to a device limited to 4 direct connections, there would be a connection error in SER 7.4 when trying to communicate with that device.
ION Devices using the serial connection (Ethergate protocol) have a limitation of one. If any other connection is made to the device (ION E Management Console, ION Setup, Telnet .etc) then SER 7.4 will not be able to connect to the device.
When a connection to an ION device is restored, it may take up to 10 minutes to be established in SER 7.4.ION Devices have connection limitations which may cause issues with SER 7.4 while simultaneously connecting from other software.
Resolution: If a connection to an ION Device cannot be established, you can use Telnet to connect to the device to see how many connections are being used (note that Telnet itself will account for one connection). Telnet can only connect to ION devices directly through TCP/IP.