Situation :
- a VFP program sends a file using commtools (with the zmodem protocol)
- the receiver is a FPDOS program also using commtools

Problem :
- in about 80 % of the cases everything goes well BUT sometimes the receiver terminates the FRECEIVE as normal, indicating the file is received correctly, but the sender's FSEND doesn't terminate and keeps trying.

What's going on ?

For your info :
- ISDN adaptors used
- RTS_CTS control is on at both sides
- files are zipped
- seems to occur with small files (<1k)