If you have control over the Codesys target file system you can increase the amount of accepted connections by accessing Codesys configuration CODESYSControl.cfg (for Win target) and the following parameters
[cmpOPCUAServer]
MaxNodesPerBrowse=100
MaxNodesPerNodeManagement=100
MaxNodesPerRead=100
MaxNodesPerWrite=100
MaxNodesPerRegisterNodes=100
MaxNodesPerTranslateBrowsePathsToNodeIds=100

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Runtime with OPC UA support

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