Hi,
registration of tp WEBDYNPRO_<SID> from host
<HostName> not allowed
this error message clear indicates, that the problem is, that from the <HostName>, where you want to reach a gateway, the registartion is not allowed. It is because the reg_info file setting on that gateway.
gw/acl_mode=0 is a workaround, that disables the gateway security, in that case all program, even unwnated programs can register on the gateway.
Rather extend the rules in reg_info file accordingly.
Afterwards reread teh reginfo file:
smgw->Goto->Expert function-> External security->reread
Maybe useful:
1592493 - GW: Problems during reginfo configuration
Regards Gabriella