In the soluble state, catalyzes glutaredoxin-like thiol disulfide exchange reactions with reduced glutathione as electron donor. Displays weak glutathione peroxidase activity (Probable) (PubMed:25581026). Can insert into membranes and form chloride ion channels. Membrane insertion seems to be redox-regulated and may occur only under oxidizing conditions. Modulates the activity of RYR2 and inhibits calcium influx. {ECO:0000269|PubMed:15147738, ECO:0000269|PubMed:15916532, ECO:0000269|PubMed:17945253, ECO:0000269|PubMed:25581026, ECO:0000305|PubMed:15147738}. This is the function of ENSG00000155962 (CLIC2, CLIC family member 2).