This is a known issue affecting vRealize Log Insight 4.3.x - 4.6.x.
This issue is resolved in vRealize Log Insight 4.7, available at
VMware Downloads.
Workaround:
To work around this issue, escape any needed backslash with a backslash proceeding it.
Example: If your password is
pass\word, type
pass\\word to to escape the needed backslash.