ECC Issues:

 ECC - Not working Node 1 unable to to connect

Timezone Issue:

1. Source $ECC_BASE/Oracle/quickInstall/env/ecc.env
2. Open $ECC_BASE/Oracle/quickInstall/EccConfig.properties
3. Change the below value:

From:
TIMEZONE=EST

To:
TIMEZONE=America/New_York

4. Go to $ECC_BASE/Oracle/quickInstall/env/ecc/ecc-config.properties and update below values.
From:

# Timezone set to sync the ECC with the source system timezone
timezone.id=EST

To:

# Timezone set to sync the ECC with the source system timezone
timezone.id=America/New_York

5. Save the files and run the following commands to run the script:

cd $ECC_BASE/Oracle/quickInstall
./createEnvFile.sh

6. Restart eccManaged services

7. Relaunch Application and log in with sysadmin and now try to access ECC Developer
NOTE: It is always recommended to use the “long form” of the Timezone which is outlined in the Globalization Guide for Oracle Applications Release 12 ( Doc ID 393861.1 ) under the time zone which is applicable for ECC as well.

Reference: ECC Developer Page Is Blank After Performing New Installation And Console Log Errors"Uncaught RangeError: Invalid time zone specified: XXX" ( Doc ID 2950249.1 )