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As far as I know, the X4170 only has a single serial port and I never heard of comf1a/comf1b devices on Solaris. What card and driver are you using ?

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also, kindly check if the port opened by your app, has a lock file created ?

Another possibility is the device not asserting a hardware control line when the serial port is set for CTS/RTS hardware handshaking, which could prevent the port from opening, I think.

When it says 'device busy' it generally means so. Try using a utility like lsof to see what's holding it open.