Recently I changed /etc/ssh/ssh_config. I changes port=22 ---> port=nnn. After I did this all my ssh bookmarks in the nautilus explorer stopped working. I could still login to the ssh shell from a terminal but it required that I include the -p nnn option. The servers still worked. I can get the nautilus to connect to the ssh thought sftp interactive mode by including a port specification. I now use sftp://user@server:22/folder instead of sftp://user@server/folder. I thought I had solved my problem at this point. This is not the case. It seems that nautilus will delete the :22 from the bookmark. It will not delete any other port number number. I assume this is because :22 is default and nautilus thinks that this specification is redundant. However if you change you ssh_config, :22 is required.
Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue for you. Can you try with the latest Ubuntu release? Thanks in advance.