I use _vfp.autoyield=.t. (yes, true) always. If autoyield is .f. as recommended, event loss is very significant.

sys(2333) does not have any relation to this question!
sys(2333,1) causes gpf, since MSWINSOCK does'nt have dual interface.

>Hi!
>
>Did you tried to play around _VFP.AutoYield property and sys(2333)? These 2 things are specially for ActiveX controls to solve certain problems. Try to change these values and see if it will help.
>
>>I try to serve a number of connections simultanously using MSWINSOCK
>>I noticed vfp seems to lose events MS WINSOCK ActiveX control events.
>>
>>When some connections are active, after ConnectionRequest event Dataarrival event will not occur or sendcomplete/error event will not occur.
>>
>>I read from some winsocket guru page that there is a winsocket ocx designed
>>for overlapping i/o. Do you have information about such OCX or DLL ?