A problem was recently reported while attempting to connect to an OMERO server using OMERO.insight 5.5.17 .
We have found the source of the problem. This is due to special characters in the password see  for more details.
We have Pull Requests currently under review.
The problem was introduced in version 5.5.16
As a temporary workaround, you can either use 5.5.15 or
escape the leading or trailing whitespace,
= themselves when entering the password into the OMERO.insight login dialog.
We will release a 5.5.19 version of OMERO.insight after our community meeting, starting 08/06/21.
Thanks for your patience
 Cannot connect with OMERO.insight 5.5.17, but can connect with OMERO.insight 5.5.15
 Cannot log in with leading or trailing whitespace, #, = or \ in your password · Issue #224 · ome/omero-insight · GitHub