Arma 3 can sometimes generate this error in the web console/rpt:

Warning: Steam Query data overflow, Mods/Signatures will not be correctly received by clients. Remove unused mods or change your server configuration to allow for more data to be sent

This error is caused by a limit on the amount of data that is transferred from the server to clients, and since the data transfer is handled by Steam libraries, it can cause these issues. There is a fix for the issue to help.

The steps to correct:

Stop the server.
Click the Config Files.
Edit the default.cfg or relevant config.
Add this to an blank line in the config: steamProtocolMaxDataSize = 2048;
Save the config and start the server.
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