Notice that a.b.c.1 is in the pool AND is also in the static translation statement.
When the router starts, if someone on the inside on a host other than 10.1.1.1 begins a connection, they will be assigned the public address a.b.c.d.1 - and ALL ports associated with that address. Thus when you try to connect to your host on a.b.c.1:23, it doesn't work. If you clear the translation table, then re-try, you might get connected.
The same result will happen with a single address in the pool if you omit the "overload" keyword.
Try adding the "overload" to your pool.
As for removing the pool, you need it if you want outbound traffic to be translated without static entries. for example, from other hosts on this network.
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