ERR CONFIG SET failed (possibly related to argument) Redis Origin: Data OSI layer 7 · Application Last updated 5 Nov 2026

Redis: (error) ERR CONFIG SET failed (possibly related to argument 'maxmemory') - can't set immutable config

CONFIG SET rejected the parameter — it is immutable at runtime, invalid, or disabled by the hosting provider.

Exact message you may see ERR CONFIG SET failed (possibly related to argument 'maxmemory')(error) ERR CONFIG SET failed (possibly related to argument 'port') - can't set immutable configERR CONFIG SET failed (possibly related to argumentReplyError: ERR CONFIG SET failedERR Unsupported CONFIG parameter
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Seen on: Redis Linux

Meaning

Some settings (bind, port, daemonize) need a restart, so edit redis.conf instead. Others fail due to invalid values/units (maxmemory 2gb). Managed Redis (ElastiCache, Memorystore, Azure) blocks CONFIG and uses parameter groups/portal settings. Check CONFIG GET param for valid values and INFO server for the version.

Common causes

  • Immutable parameter (needs restart)
  • Invalid value or unit
  • CONFIG renamed/disabled (rename-command CONFIG "")
  • Managed service blocking CONFIG
  • ACL without +config

⚡ Quick fix

  1. Edit redis.conf and restart for immutable settings
  2. Use the provider's parameter group/portal
  3. Check ACL GETUSER for +config and rename-command lines

Detailed fix by platform

Linux

  1. redis-cli CONFIG GET maxmemory; redis-cli CONFIG SET maxmemory 2gb

How to diagnose

  1. Parameter — Mutable?
  2. Provider — Managed?
  3. ACL — config allowed?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Data. Errors that are often confused with or caused by this one (click to open):

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