Since it gives a NAT error the reason could be the bug in one of the IOS release, the Cisco IOS Software Release 12.1(3.4) and higher. For these releases, NAT does not work for some of the applications. The following document has the information on this.
Field Notice:NAT Issues with Cisco IOS. Software Release 12.1(4)
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...