Gnomme, do you mean stop/start IPS while you have an SSL VPN session running, or that it only works when IPS is stopped?
Cheers - Bob
/var/log/ips/2009/05/ips-2009-05-31.log.gz:2009:05:31-04:37:12 gatekeeper snort[31502]: id="2101" severity="warn" sys="SecureNet" sub="ips" name="Intrusion protection alert" action="drop" reason="MISC MS Terminal Server no encryption session initiation attempt" group="110" srcip="***.***.145.177" dstip="192.168.1.2" proto="6" srcport="1745" dstport="3389" sid="2418" class="Attempted Denial of Service" priority="2" generator="1" msgid="0"
/var/log/ips/2009/05/ips-2009-05-31.log.gz:2009:05:31-04:37:12 gatekeeper snort[31502]: id="2101" severity="warn" sys="SecureNet" sub="ips" name="Intrusion protection alert" action="drop" reason="MISC MS Terminal Server no encryption session initiation attempt" group="110" srcip="***.***.145.177" dstip="192.168.1.2" proto="6" srcport="1745" dstport="3389" sid="2418" class="Attempted Denial of Service" priority="2" generator="1" msgid="0"