"Unfortunately, the accumulated and 'pending Sessions' in RepServer never disappear !!!
We did not find mention of that in 'Ebf' released, so we will open a Case at Sybase."
The repserver should not be spawning 10's/100's of rogue/orphan USER connections when the repagent fails to connect (due to 'log transfer' being disabled). Period.
Now, whether this problem is related to a repserver bug, or a problem with your platform/environment (think compatibility issue, or missing/wrong OS libs, or ???), is hard to tell at this point.
The best option at this point is exactly what you've done ... open a case with Sybase tech support. ("Duh, Mark!" ?)